diff --git a/agri-admin/src/main/resources/application-mqtt.yml b/agri-admin/src/main/resources/application-mqtt.yml
index e654987..6de3ecd 100644
--- a/agri-admin/src/main/resources/application-mqtt.yml
+++ b/agri-admin/src/main/resources/application-mqtt.yml
@@ -9,7 +9,6 @@ spring:
     qos: 1  # 消息可靠性
     timeout: 60 # 连接超时
     keep-alive: 60 # 心跳间隔
-    auto-off-seconds: 30 #自动关延迟秒数。
     latest-ttl-seconds: 120 #设备最新状态缓存的过期时间（秒）。
     # 自动关闭任务线程池大小
     auto-off-thread-pool-size: 5
\ No newline at end of file
diff --git a/agri-framework/src/main/java/com/agri/framework/interceptor/MqttMessageHandler.java b/agri-framework/src/main/java/com/agri/framework/interceptor/MqttMessageHandler.java
index 81ac89b..cfde2de 100644
--- a/agri-framework/src/main/java/com/agri/framework/interceptor/MqttMessageHandler.java
+++ b/agri-framework/src/main/java/com/agri/framework/interceptor/MqttMessageHandler.java
@@ -40,9 +40,10 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Function;
@@ -797,12 +798,23 @@ public class MqttMessageHandler implements SmartLifecycle {
         if (isRunning.compareAndSet(false, true)) {
             try {
                 // 初始化多线程池（固定线程数）
-                autoOffExecutor = Executors.newScheduledThreadPool(autoOffThreadPoolSize, r -> {
-                    Thread thread = new Thread(r);
-                    thread.setName("auto-off-task-" + thread.getId());
-                    thread.setDaemon(true); // 设置为守护线程，不阻塞JVM退出
-                    return thread;
-                });
+                autoOffExecutor = new ScheduledThreadPoolExecutor(
+                        autoOffThreadPoolSize, // 核心线程数
+                        r -> {
+                            Thread thread = new Thread(r);
+                            thread.setName("auto-off-task-" + thread.getId());
+                            thread.setDaemon(true); // 设置为守护线程，不阻塞JVM退出
+                            return thread;
+                        },
+                        new ThreadPoolExecutor.CallerRunsPolicy() // 队列压力或关闭时兜底不丢任务
+                );
+
+                // 关键优化1：取消任务后立即从队列移除，避免队列堆积
+                ((ScheduledThreadPoolExecutor) autoOffExecutor).setRemoveOnCancelPolicy(true);
+
+                // 关键优化2：允许核心线程超时回收，空闲时省资源
+                ((ScheduledThreadPoolExecutor) autoOffExecutor).setKeepAliveTime(60, TimeUnit.SECONDS);
+                ((ScheduledThreadPoolExecutor) autoOffExecutor).allowCoreThreadTimeOut(true);
 
                 // 核心修改：无论是否已连接，都执行订阅
                 subscribeTopics();