Multifunctional fire-fighting building alarm device

The utility model relates to the technical field of fire-fighting alarm devices, and discloses a multifunctional fire-fighting building alarm device which comprises a wall body and a positioning block installed on the surface of the wall body, positioning bolts connected with the wall body are arranged at the upper end and the lower end of the positioning block, limiting plates are arranged at the front ends of the upper end and the lower end of the positioning block, and through holes are formed in the front ends of the limiting plates. And a positioning box is arranged in front of the positioning block. The inserting opening in the rear wall of the positioning box is aligned with the limiting plate, the positioning box is moved backwards to be in butt joint with the limiting plate, the positioning box and the positioning block are integrated, the limiting rod is inserted into the through hole in the top of the positioning box, the limiting rod penetrates through the inserting opening and the inserting hole,