Toxic gas alarm with anti-theft function

The utility model discloses a poisonous gas alarm with an anti-theft function, and relates to the technical field of alarms, in particular to a poisonous gas alarm with an anti-theft function, which comprises a wall top plate and a fastening stud, the fastening stud is fixedly mounted at the bottom of the wall top plate, a mounting frame is arranged below the wall top plate, and the wall top plate is fixedly mounted on the mounting frame. The outer surface of the fastening stud is in threaded connection with a fastening nut, and a fixing frame is fixedly mounted on the inner side of the mounting frame. According to the toxic gas alarm with the anti-theft function, the alarm body is in linkage with the two-way hydraulic rod to start, the two-way hydraulic rod can drive the moving block to move, then the moving block drives the driving rod to drive, the driving rod can drive the bearing plate to ascend, and then the bearing plate drives the four-way sound amplifying cover to ascend; the alarm body can be covere