diff --git a/api/middleware/schedule/scheduledJobs.js b/api/middleware/schedule/scheduledJobs.js
index 184379f..744a01a 100644
--- a/api/middleware/schedule/scheduledJobs.js
+++ b/api/middleware/schedule/scheduledJobs.js
@@ -161,41 +161,63 @@ class ScheduledJobs {
      */
     async cleanupOfflineDeviceTasks() {
         try {
-            // 移除 device_status 依赖，离线任务清理功能暂时禁用
-            // 如果需要在 pla_account 表中添加在线状态字段，可以重新实现此功能
-            console.log('[清理离线任务] device_status 已移除，功能暂时禁用');
-            return;
-            
-            /* 原有代码已注释
-            const Sequelize = require('sequelize');
-            const { device_status, task_status, op } = db.models;
-            
             // 离线阈值：10分钟
             const offlineThreshold = 10 * 60 * 1000; // 10分钟
-            const now = new Date();
-            const thresholdTime = new Date(now.getTime() - offlineThreshold);
+            const now = Date.now();
+            const thresholdTime = now - offlineThreshold;
 
-            // 查询离线超过10分钟的设备
-            const offlineDevices = await device_status.findAll({
+            // 获取所有启用的账号
+            const pla_account = db.getModel('pla_account');
+            const accounts = await pla_account.findAll({
                 where: {
-                    isOnline: false,
-                    lastHeartbeatTime: {
-                        [op.lt]: thresholdTime
-                    }
+                    is_delete: 0,
+                    is_enabled: 1
                 },
-                attributes: ['sn_code', 'lastHeartbeatTime']
+                attributes: ['sn_code']
             });
 
-            if (!offlineDevices || offlineDevices.length === 0) {
+            if (!accounts || accounts.length === 0) {
+                return;
+            }
+
+            // 通过 deviceManager 检查哪些设备离线超过10分钟
+            const offlineSnCodes = [];
+            const offlineDevicesInfo = [];
+
+            for (const account of accounts) {
+                const sn_code = account.sn_code;
+                const device = deviceManager.devices.get(sn_code);
+                
+                if (!device) {
+                    // 设备从未发送过心跳，视为离线
+                    offlineSnCodes.push(sn_code);
+                    offlineDevicesInfo.push({
+                        sn_code: sn_code,
+                        lastHeartbeatTime: null
+                    });
+                } else {
+                    // 检查最后心跳时间
+                    const lastHeartbeat = device.lastHeartbeat || 0;
+                    if (lastHeartbeat < thresholdTime || !device.isOnline) {
+                        offlineSnCodes.push(sn_code);
+                        offlineDevicesInfo.push({
+                            sn_code: sn_code,
+                            lastHeartbeatTime: lastHeartbeat ? new Date(lastHeartbeat) : null
+                        });
+                    }
+                }
+            }
+
+            if (offlineSnCodes.length === 0) {
                 return;
             }
 
-            const offlineSnCodes = offlineDevices.map(dev => dev.sn_code);
             console.log(`[清理离线任务] 发现 ${offlineSnCodes.length} 个离线超过10分钟的设备: ${offlineSnCodes.join(', ')}`);
 
             let totalCancelled = 0;
 
             // 为每个离线设备取消任务
+            const task_status = db.getModel('task_status');
             for (const sn_code of offlineSnCodes) {
                 try {
                     // 查询该设备的所有pending/running任务
@@ -211,6 +233,8 @@ class ScheduledJobs {
                         continue;
                     }
 
+                    const deviceInfo = offlineDevicesInfo.find(d => d.sn_code === sn_code);
+
                     // 更新任务状态为cancelled
                     const updateResult = await task_status.update(
                         {
@@ -218,7 +242,7 @@ class ScheduledJobs {
                             endTime: new Date(),
                             result: JSON.stringify({ 
                                 reason: '设备离线超过10分钟，任务已自动取消',
-                                offlineTime: offlineDevices.find(d => d.sn_code === sn_code)?.lastHeartbeatTime
+                                offlineTime: deviceInfo?.lastHeartbeatTime
                             })
                         },
                         {
@@ -246,7 +270,6 @@ class ScheduledJobs {
             if (totalCancelled > 0) {
                 console.log(`[清理离线任务] 共取消 ${totalCancelled} 个离线设备的任务`);
             }
-            */
         } catch (error) {
             console.error('[清理离线任务] 执行失败:', error);
         }