diff --git a/workspace_monitor.py b/workspace_monitor.py
index 2b6cf85..5163bfe 100644
--- a/workspace_monitor.py
+++ b/workspace_monitor.py
@@ -295,6 +295,13 @@ try:
                 
         def toggle_monitoring(self):
             if not self.running:
+                # 开始监控时重置所有计时相关变量
+                self.last_face_time = time.time()
+                self.no_face_duration = 0
+                self.progress_bar.setValue(0)
+                self.progress_bar.setFormat("离开时间: 0s")
+                self.set_progress_bar_style("#4CAF50")
+                
                 self.running = True
                 self.start_stop_btn.setText("停止监控")
                 self.start_stop_btn.setStyleSheet("background-color: #ff4444;")