Anti-backflow detection alarm device

The utility model discloses an anti-backflow detection alarm device, and relates to the anti-backflow alarm technology field, the anti-backflow detection alarm device comprises an alarm assembly, a flexible bag, a guide pipe and a moving plug, one end of the guide pipe is hermetically communicated with an opening of the flexible bag, the other end of the guide pipe is fixedly connected with the alarm assembly, and the moving plug is fixedly connected with the flexible bag. The movable plug is located in the guide pipe and is in sealed sliding connection with the inner wall face of the guide pipe, a liquid storage space defined by the movable plug, the guide pipe and the flexible bag is used for being filled with thrust liquid, a pressing part is arranged at the end, close to the alarm assembly, of the movable plug, and when the movable plug moves towards the alarm assembly, the thrust liquid is pressed by the pressing part. The pressing part can activate the alarm assembly to give an alarm, the service life o