diff --git a/app/pages/users.vue b/app/pages/users.vue
index 00daf89..45c867e 100644
--- a/app/pages/users.vue
+++ b/app/pages/users.vue
@@ -1,10 +1,17 @@
 <script setup lang="ts">
+import { formatFileSize } from '~/composables/useFileSize'
+
 interface AdminUser {
   id: number
   username: string
   role: 'admin' | 'user'
   created_at: string
   password_reset: number
+  usage?: {
+    imageBytes: number
+    videoBytes: number
+    fileBytes: number
+  }
 }
 
 const {
@@ -21,6 +28,18 @@ const { t } = useI18n()
 
 const users = ref<AdminUser[]>([])
 const loading = ref(false)
+const deleteTarget = ref<AdminUser | null>(null)
+const deleteConfirm = ref('')
+const deleting = ref(false)
+
+const canDelete = computed(() =>
+  Boolean(
+    deleteTarget.value
+    && deleteTarget.value.role !== 'admin'
+    && deleteConfirm.value.trim() === deleteTarget.value.username
+    && !deleting.value
+  )
+)
 
 async function loadUsers() {
   if (!isAdmin.value) return
@@ -57,6 +76,51 @@ async function clearPassword(user: AdminUser) {
   }
 }
 
+function openDeleteDialog(user: AdminUser) {
+  if (user.role === 'admin') return
+  deleteTarget.value = user
+  deleteConfirm.value = ''
+}
+
+function closeDeleteDialog() {
+  if (deleting.value) return
+  deleteTarget.value = null
+  deleteConfirm.value = ''
+}
+
+function onDeleteOpenChange(open: boolean) {
+  if (!open) closeDeleteDialog()
+}
+
+async function deleteUser() {
+  const target = deleteTarget.value
+  if (!target || !canDelete.value) return
+
+  deleting.value = true
+  try {
+    await $fetch(`/api/admin/users/${target.id}/delete`, {
+      method: 'POST',
+      credentials: 'include',
+      body: { confirmation: deleteConfirm.value.trim() }
+    })
+    toast.add({
+      title: t('users.userDeleted', { name: target.username }),
+      color: 'success'
+    })
+    deleteTarget.value = null
+    deleteConfirm.value = ''
+    await loadUsers()
+  } catch (error: unknown) {
+    handleAuthError(error)
+    toast.add({
+      title: getFetchErrorMessage(error, t('users.deleteFailed')),
+      color: 'error'
+    })
+  } finally {
+    deleting.value = false
+  }
+}
+
 function formatDate(value: string) {
   try {
     return new Date(value).toLocaleString()
@@ -150,24 +214,83 @@ onMounted(async () => {
             </p>
           </div>
 
-          <UBadge
-            v-if="user.password_reset === 1"
-            color="warning"
-            variant="subtle"
-            size="sm"
+          <div
+            v-if="user.role !== 'admin'"
+            class="flex flex-wrap items-center gap-x-3 gap-y-1 text-xs text-muted"
           >
-            {{ t('users.resetPending') }}
-          </UBadge>
-          <UButton
-            v-else
-            variant="outline"
-            color="warning"
-            size="sm"
-            :label="t('users.clearPassword')"
-            @click="clearPassword(user)"
-          />
+            <span>{{ t('users.usageImages') }} {{ formatFileSize(user.usage?.imageBytes ?? 0) }}</span>
+            <span>{{ t('users.usageVideos') }} {{ formatFileSize(user.usage?.videoBytes ?? 0) }}</span>
+            <span>{{ t('users.usageFiles') }} {{ formatFileSize(user.usage?.fileBytes ?? 0) }}</span>
+          </div>
+          <div
+            v-if="user.role !== 'admin'"
+            class="flex items-center gap-2"
+          >
+            <UBadge
+              v-if="user.password_reset === 1"
+              color="warning"
+              variant="subtle"
+              size="sm"
+            >
+              {{ t('users.resetPending') }}
+            </UBadge>
+            <UButton
+              v-if="user.password_reset !== 1"
+              variant="outline"
+              color="warning"
+              size="sm"
+              :label="t('users.clearPassword')"
+              @click="clearPassword(user)"
+            />
+            <UButton
+              variant="outline"
+              color="error"
+              size="sm"
+              :label="t('users.deleteUser')"
+              @click="openDeleteDialog(user)"
+            />
+          </div>
         </li>
       </ul>
     </AppShell>
+
+    <UModal
+      :open="Boolean(deleteTarget)"
+      :title="t('users.deleteTitle')"
+      :description="t('users.deleteWarning')"
+      @update:open="onDeleteOpenChange"
+    >
+      <template #body>
+        <div class="space-y-2">
+          <p class="text-sm text-muted">
+            {{ t('users.deleteConfirmLabel', { name: deleteTarget?.username ?? '' }) }}
+          </p>
+          <UInput
+            v-model="deleteConfirm"
+            :placeholder="deleteTarget?.username"
+            class="w-full"
+            autocomplete="off"
+          />
+        </div>
+      </template>
+      <template #footer>
+        <div class="flex justify-end gap-2">
+          <UButton
+            :label="t('common.cancel')"
+            color="neutral"
+            variant="outline"
+            :disabled="deleting"
+            @click="closeDeleteDialog"
+          />
+          <UButton
+            :label="t('users.deleteSubmit')"
+            color="error"
+            :loading="deleting"
+            :disabled="!canDelete"
+            @click="deleteUser"
+          />
+        </div>
+      </template>
+    </UModal>
   </div>
 </template>
diff --git a/i18n/locales/en.json b/i18n/locales/en.json
index 0950c6b..6f2f91e 100644
--- a/i18n/locales/en.json
+++ b/i18n/locales/en.json
@@ -1283,14 +1283,25 @@
   ,
   "users": {
     "title": "Users",
-    "subtitle": "Review accounts and clear passwords; users set a new one on next login",
+    "subtitle": "Review accounts, clear passwords, or delete users",
     "adminOnly": "Admins only",
     "roleAdmin": "Admin",
     "roleUser": "User",
     "clearPassword": "Clear password",
+    "deleteUser": "Delete user",
+    "usageImages": "Images",
+    "usageVideos": "Videos",
+    "usageFiles": "Files",
     "resetPending": "Reset pending",
     "passwordCleared": "Cleared password for {name}",
     "clearFailed": "Operation failed",
+    "deleteTitle": "Delete user?",
+    "deleteWarning": "This permanently deletes the user's current images, videos, files, tags, and login sessions. Admin and other users' data are not affected. This cannot be undone.",
+    "deleteConfirmLabel": "Type the username {name} to confirm",
+    "deleteSubmit": "Delete user",
+    "deleteFailed": "Delete failed",
+    "userDeleted": "Deleted user {name}",
+    "adminProtected": "Admin accounts cannot be cleared or deleted",
     "loadFailed": "Failed to load users"
   },
   "reset": {
diff --git a/i18n/locales/zh-CN.json b/i18n/locales/zh-CN.json
index b988d49..e79e316 100644
--- a/i18n/locales/zh-CN.json
+++ b/i18n/locales/zh-CN.json
@@ -1286,14 +1286,25 @@
   ,
   "users": {
     "title": "用户管理",
-    "subtitle": "查看账号并清除密码，用户下次登录时重新设置",
+    "subtitle": "查看账号、清除密码或注销用户",
     "adminOnly": "仅管理员可访问此页面",
     "roleAdmin": "管理员",
     "roleUser": "普通用户",
     "clearPassword": "清除密码",
+    "deleteUser": "注销用户",
+    "usageImages": "图片",
+    "usageVideos": "视频",
+    "usageFiles": "文件",
     "resetPending": "待重置密码",
     "passwordCleared": "已清除 {name} 的密码",
     "clearFailed": "操作失败",
+    "deleteTitle": "注销用户？",
+    "deleteWarning": "将永久删除该用户当前的图片、视频、文件、标签和登录会话。管理员数据和其他用户数据不受影响，此操作不可恢复。",
+    "deleteConfirmLabel": "输入用户名 {name} 确认注销",
+    "deleteSubmit": "确认注销",
+    "deleteFailed": "注销失败",
+    "userDeleted": "已注销用户 {name}",
+    "adminProtected": "管理员账号不可清除密码或注销",
     "loadFailed": "读取用户列表失败"
   },
   "reset": {
diff --git a/server/api/admin/users/[id]/delete.post.ts b/server/api/admin/users/[id]/delete.post.ts
new file mode 100644
index 0000000..9706cae
--- /dev/null
+++ b/server/api/admin/users/[id]/delete.post.ts
@@ -0,0 +1,61 @@
+import { requireAdminAuth } from '../../../../utils/access'
+import { createApiError } from '../../../../utils/api-error'
+import { logActivity } from '../../../../utils/activity-log'
+import { findUserById } from '../../../../utils/db'
+import { deleteUserCurrentData } from '../../../../utils/user-storage'
+
+export default defineEventHandler(async (event) => {
+  const operator = await requireAdminAuth(event)
+
+  const id = Number(getRouterParam(event, 'id'))
+  const target = Number.isInteger(id) ? findUserById(id) : null
+  if (!target) {
+    createApiError(event, 'INVALID_REQUEST', '用户不存在', 404)
+  }
+  if (target.role === 'admin') {
+    createApiError(event, 'FORBIDDEN', '不允许注销管理员账号', 403)
+  }
+  if (target.id === operator.id) {
+    createApiError(event, 'INVALID_REQUEST', '不能注销当前登录账号', 400)
+  }
+
+  const body = await readBody<{ confirmation?: string }>(event).catch(() => null)
+  if (body?.confirmation?.trim() !== target.username) {
+    createApiError(event, 'INVALID_REQUEST', '请输入用户名确认注销', 400)
+  }
+
+  try {
+    const result = await deleteUserCurrentData(target.id)
+    if (result.failed.length) {
+      createApiError(
+        event,
+        'CONFLICT',
+        `有 ${result.failed.length} 个媒体删除失败，账号未注销，请重试`,
+        409
+      )
+    }
+
+    logActivity(event, {
+      action: 'delete',
+      key: `users/${target.id}`,
+      originalName: '已注销用户',
+      source: 'admin',
+      userId: operator.id
+    })
+
+    return { success: true, ...result }
+  } catch (error: unknown) {
+    if (error instanceof Error) {
+      if (error.message === 'USER_STORAGE_CLEAR_IN_PROGRESS') {
+        createApiError(event, 'CONFLICT', '用户数据正在清理，请勿重复操作', 409)
+      }
+      if (error.message === 'USER_STORAGE_CLEAR_ACTIVE_JOB') {
+        createApiError(event, 'CONFLICT', '该用户有正在运行的任务，请完成后再注销', 409)
+      }
+      if (error.message === 'ADMIN_USER_DELETE_FORBIDDEN') {
+        createApiError(event, 'FORBIDDEN', '不允许注销管理员账号', 403)
+      }
+    }
+    throw error
+  }
+})
diff --git a/server/api/admin/users/index.get.ts b/server/api/admin/users/index.get.ts
index 4f432b0..a4e457b 100644
--- a/server/api/admin/users/index.get.ts
+++ b/server/api/admin/users/index.get.ts
@@ -1,7 +1,7 @@
 import { requireAdminAuth } from '../../../utils/access'
-import { listAdminUsers } from '../../../utils/db'
+import { listAdminUsersWithUsage } from '../../../utils/db'
 
 export default defineEventHandler(async (event) => {
   await requireAdminAuth(event)
-  return { users: listAdminUsers() }
+  return { users: listAdminUsersWithUsage() }
 })
diff --git a/server/utils/db.ts b/server/utils/db.ts
index 9487ce7..54598b0 100644
--- a/server/utils/db.ts
+++ b/server/utils/db.ts
@@ -459,6 +459,12 @@ export interface AdminUserRow {
   password_reset: number
 }
 
+export interface AdminUserUsage {
+  imageBytes: number
+  videoBytes: number
+  fileBytes: number
+}
+
 /** 管理员用户列表 */
 export function listAdminUsers(): AdminUserRow[] {
   ensurePasswordResetColumn()
@@ -468,6 +474,42 @@ export function listAdminUsers(): AdminUserRow[] {
   `).all() as unknown as AdminUserRow[]
 }
 
+/** 管理员用户列表，附带图片、视频、文件占用 */
+export function listAdminUsersWithUsage(): Array<AdminUserRow & { usage: AdminUserUsage }> {
+  const usage = new Map<number, AdminUserUsage>()
+  const rows = getDb().prepare(`
+    SELECT user_id, media_type, COALESCE(SUM(size), 0) AS bytes
+    FROM images
+    WHERE user_id IS NOT NULL
+    GROUP BY user_id, media_type
+  `).all() as Array<{ user_id: number, media_type: string, bytes: number }>
+
+  for (const row of rows) {
+    const entry = usage.get(row.user_id) ?? {
+      imageBytes: 0,
+      videoBytes: 0,
+      fileBytes: 0
+    }
+    if (row.media_type === 'video') {
+      entry.videoBytes = Number(row.bytes)
+    } else if (row.media_type === 'file') {
+      entry.fileBytes = Number(row.bytes)
+    } else {
+      entry.imageBytes = Number(row.bytes)
+    }
+    usage.set(row.user_id, entry)
+  }
+
+  return listAdminUsers().map(user => ({
+    ...user,
+    usage: usage.get(user.id) ?? {
+      imageBytes: 0,
+      videoBytes: 0,
+      fileBytes: 0
+    }
+  }))
+}
+
 /** 清空密码并标记需要重置 */
 export function clearUserPassword(userId: number): void {
   ensurePasswordResetColumn()
diff --git a/server/utils/user-storage.test.ts b/server/utils/user-storage.test.ts
index da63f87..52549c1 100644
--- a/server/utils/user-storage.test.ts
+++ b/server/utils/user-storage.test.ts
@@ -5,7 +5,8 @@ import { describe, expect, it } from 'vitest'
 import {
   getDb,
   insertActivityLog,
-  insertUser
+  insertUser,
+  listAdminUsersWithUsage
 } from './db'
 import {
   listImageIndexRowsForUser,
@@ -16,7 +17,7 @@ import { ensureDefaultBackends } from './storage-backends'
 import { getActiveBackend } from './storage/resolver'
 import { putImage } from './storage'
 import { createTag } from './tags'
-import { clearUserStorage } from './user-storage'
+import { clearUserStorage, deleteUserCurrentData } from './user-storage'
 import {
   createBackupJob,
   getBackupJob,
@@ -142,4 +143,81 @@ describe('clearUserStorage', () => {
     await expect(fs.access(archiveA)).rejects.toThrow()
     await expect(fs.access(archiveB)).resolves.toBeUndefined()
   })
+
+  it('deletes current user data without deleting backups or admin audit data', async () => {
+    ensureDefaultBackends()
+    const now = new Date().toISOString()
+    const admin = insertUser({
+      username: 'delete-admin',
+      passwordHash: 'admin-hash',
+      role: 'admin',
+      createdAt: now
+    })
+    const user = insertUser({
+      username: 'delete-user',
+      passwordHash: 'user-hash',
+      role: 'user',
+      createdAt: now
+    })
+    const key = 'images/2026/10/delete-user.webp'
+    const target = await getActiveBackend()
+
+    await putImage(key, new Uint8Array([1]), {
+      originalName: 'delete-user.webp',
+      uploadedAt: now,
+      contentType: 'image/webp',
+      size: 1,
+      userId: user,
+      mediaType: 'image'
+    })
+    const tag = createTag(user, 'delete tag')
+    getDb().prepare('INSERT INTO image_tags (image_key, tag_id) VALUES (?, ?)')
+      .run(key, tag.id)
+    getDb().prepare(`
+      INSERT INTO sessions (id, user_id, token_hash, expires_at, created_at)
+      VALUES (?, ?, ?, ?, ?)
+    `).run('delete-session', user, 'hash', now, now)
+    insertActivityLog({
+      action: 'upload',
+      key,
+      originalName: 'delete-user.webp',
+      size: 1,
+      contentType: 'image/webp',
+      source: 'web',
+      userId: user
+    })
+    insertActivityLog({
+      action: 'settings',
+      key: `users/${user}/clear-password`,
+      originalName: 'delete-user',
+      size: 0,
+      contentType: '',
+      source: 'admin',
+      userId: admin
+    })
+    const job = createBackupJob({ type: 'full_export', userId: user })
+    markJobDone(job.id, {})
+
+    const listed = listAdminUsersWithUsage().find(item => item.id === user)
+    expect(listed?.usage.imageBytes).toBe(1)
+
+    const result = await deleteUserCurrentData(user)
+
+    expect(result.failed).toEqual([])
+    expect(result.deletedMedia).toBe(1)
+    expect(result.deletedTags).toBe(1)
+    expect(await target.head(key)).toBeNull()
+    expect(getDb().prepare('SELECT 1 FROM users WHERE id = ?').get(user)).toBeUndefined()
+    expect(getDb().prepare('SELECT 1 FROM sessions WHERE user_id = ?').get(user)).toBeUndefined()
+    expect(getDb().prepare('SELECT 1 FROM images WHERE user_id = ?').get(user)).toBeUndefined()
+    expect(getDb().prepare('SELECT 1 FROM tags WHERE user_id = ?').get(user)).toBeUndefined()
+    expect(getDb().prepare('SELECT 1 FROM activity_logs WHERE user_id = ?').get(user)).toBeUndefined()
+    expect(getDb().prepare(`
+      SELECT original_name FROM activity_logs
+      WHERE user_id = ? AND key = ?
+    `).get(admin, `users/${user}/clear-password`)).toEqual({ original_name: '已注销用户' })
+    expect(getDb().prepare('SELECT 1 FROM backup_jobs WHERE id = ?').get(job.id)).toBeDefined()
+
+    await expect(deleteUserCurrentData(admin)).rejects.toThrow('ADMIN_USER_DELETE_FORBIDDEN')
+  })
 })
diff --git a/server/utils/user-storage.ts b/server/utils/user-storage.ts
index 4302d62..5c34901 100644
--- a/server/utils/user-storage.ts
+++ b/server/utils/user-storage.ts
@@ -34,6 +34,11 @@ export interface ClearUserStorageResult {
   failed: Array<{ key: string, message: string }>
 }
 
+export interface ClearUserStorageOptions {
+  /** 用户注销时保留备份任务，避免影响管理员的备份数据 */
+  deleteBackupJobs?: boolean
+}
+
 async function deleteObject(
   backend: StorageBackend,
   key: string
@@ -73,7 +78,11 @@ async function removeBackupJobArtifacts(job: BackupJob): Promise<void> {
   }
 }
 
-export async function clearUserStorage(userId: number): Promise<ClearUserStorageResult> {
+export async function clearUserStorage(
+  userId: number,
+  options: ClearUserStorageOptions = {}
+): Promise<ClearUserStorageResult> {
+  const deleteBackupJobs = options.deleteBackupJobs !== false
   if (activeUsers.has(userId)) {
     throw new Error('USER_STORAGE_CLEAR_IN_PROGRESS')
   }
@@ -94,7 +103,7 @@ export async function clearUserStorage(userId: number): Promise<ClearUserStorage
       throw new Error('USER_STORAGE_CLEAR_ACTIVE_JOB')
     }
 
-    const backupJobs = listAllBackupJobsForUser(userId)
+    const backupJobs = deleteBackupJobs ? listAllBackupJobsForUser(userId) : []
     const rows = listImageIndexRowsForUser(userId)
     for (const row of rows) {
       try {
@@ -158,7 +167,7 @@ export async function clearUserStorage(userId: number): Promise<ClearUserStorage
       }
     }
 
-    if (!result.failed.length) {
+    if (!result.failed.length && deleteBackupJobs) {
       for (const job of backupJobs) {
         await removeBackupJobArtifacts(job)
       }
@@ -171,3 +180,38 @@ export async function clearUserStorage(userId: number): Promise<ClearUserStorage
     activeUsers.delete(userId)
   }
 }
+
+/** 管理员注销用户：清理当前有效数据，但保留备份与管理员审计数据 */
+export async function deleteUserCurrentData(
+  userId: number
+): Promise<ClearUserStorageResult> {
+  const db = getDb()
+  const target = db.prepare('SELECT id, username, role FROM users WHERE id = ?')
+    .get(userId) as { id: number, username: string, role: string } | undefined
+
+  if (!target) throw new Error('USER_NOT_FOUND')
+  if (target.role === 'admin') throw new Error('ADMIN_USER_DELETE_FORBIDDEN')
+
+  // 先终止会话，避免清理过程中继续上传；失败时用户仍可重新登录。
+  db.prepare('DELETE FROM sessions WHERE user_id = ?').run(userId)
+
+  const result = await clearUserStorage(userId, { deleteBackupJobs: false })
+  if (result.failed.length) return result
+
+  db.exec('BEGIN')
+  try {
+    db.prepare('DELETE FROM sessions WHERE user_id = ?').run(userId)
+    db.prepare(`
+      UPDATE activity_logs
+      SET original_name = '已注销用户'
+      WHERE key LIKE ?
+    `).run(`users/${userId}/%`)
+    db.prepare('DELETE FROM users WHERE id = ?').run(userId)
+    db.exec('COMMIT')
+  } catch (error) {
+    db.exec('ROLLBACK')
+    throw error
+  }
+
+  return result
+}