diff --git a/web-vue/src/router/index.js b/web-vue/src/router/index.js
index dadef08..3253342 100644
--- a/web-vue/src/router/index.js
+++ b/web-vue/src/router/index.js
@@ -44,13 +44,29 @@ const router = createRouter({
   routes
 })
 
-router.beforeEach((to, from, next) => {
+router.beforeEach(async (to, from, next) => {
   const token = localStorage.getItem('token')
 
   if (to.meta.requiresAuth && !token) {
     next('/login')
   } else if (to.path === '/login' && token) {
     next('/desktop')
+  } else if (to.meta.requiresAuth && token) {
+    // 有 token 且要进需认证页面，先验证后端是否可用
+    try {
+      await fetch('/api/files/test')
+      next()
+    } catch {
+      // 后端不可用，清除登录状态跳转登录页
+      localStorage.removeItem('token')
+      localStorage.removeItem('username')
+      localStorage.removeItem('userId')
+      localStorage.removeItem('nickname')
+      localStorage.removeItem('avatar')
+      localStorage.removeItem('storageUsed')
+      localStorage.removeItem('storageLimit')
+      window.location.href = '/login'
+    }
   } else {
     next()
   }