diff --git a/backend/database.js b/backend/database.js
index c77a442..0a5c591 100644
--- a/backend/database.js
+++ b/backend/database.js
@@ -326,7 +326,8 @@ const ShareDB = {
     return {
       id: result.lastInsertRowid,
       share_code: shareCode,
-      share_type: share_type
+      share_type: share_type,
+      expires_at: expiresAt,
     };
   },
 
diff --git a/backend/server.js b/backend/server.js
index 7cac112..13a8a66 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -1505,7 +1505,8 @@ app.post('/api/share/create', authMiddleware, (req, res) => {
       message: '分享链接创建成功',
       share_code: result.share_code,
       share_url: shareUrl,
-      share_type: result.share_type
+      share_type: result.share_type,
+      expires_at: result.expires_at,
     });
   } catch (error) {
     console.error('创建分享链接失败:', error);
diff --git a/frontend/share.html b/frontend/share.html
index b553bee..972e84e 100644
--- a/frontend/share.html
+++ b/frontend/share.html
@@ -524,6 +524,8 @@
           <p style="color: #666; margin-bottom: 20px;">
             分享者: <strong>{{ shareInfo.username }}</strong> |
             创建时间: {{ formatDate(shareInfo.created_at) }}
+            <span v-if="shareInfo.expires_at"> | 到期时间: <strong :style="{color: isExpiringSoon(shareInfo.expires_at) ? '#ffc107' : isExpired(shareInfo.expires_at) ? '#dc3545' : '#28a745'}">{{ formatExpireTime(shareInfo.expires_at) }}</strong></span>
+            <span v-else> | 有效期: <strong style="color: #28a745;">永久有效</strong></span>
           </p>
 
           <!-- 视图切换按钮 (多文件时才显示) -->
@@ -822,6 +824,56 @@
             hour12: false
           });
         }
+,
+
+        // 格式化到期时间显示
+        formatExpireTime(expiresAt) {
+          if (!expiresAt) return '永久有效';
+
+          const expireDate = new Date(expiresAt);
+          const now = new Date();
+          const diffMs = expireDate - now;
+          const diffDays = Math.ceil(diffMs / (1000 * 60 * 60 * 24));
+
+          // 格式化日期
+          const dateStr = expireDate.toLocaleString('zh-CN', {
+            year: 'numeric',
+            month: '2-digit',
+            day: '2-digit',
+            hour: '2-digit',
+            minute: '2-digit'
+          });
+
+          if (diffDays < 0) {
+            return `已过期 (${dateStr})`;
+          } else if (diffDays === 0) {
+            return `今天过期 (${dateStr})`;
+          } else if (diffDays === 1) {
+            return `明天过期 (${dateStr})`;
+          } else if (diffDays <= 7) {
+            return `${diffDays}天后过期 (${dateStr})`;
+          } else {
+            return dateStr;
+          }
+        },
+
+        // 判断是否即将过期（3天内）
+        isExpiringSoon(expiresAt) {
+          if (!expiresAt) return false;
+          const expireDate = new Date(expiresAt);
+          const now = new Date();
+          const diffMs = expireDate - now;
+          const diffDays = diffMs / (1000 * 60 * 60 * 24);
+          return diffDays > 0 && diffDays <= 3;
+        },
+
+        // 判断是否已过期
+        isExpired(expiresAt) {
+          if (!expiresAt) return false;
+          const expireDate = new Date(expiresAt);
+          const now = new Date();
+          return expireDate <= now;
+        }
       },
 
       mounted() {