Elevator safety detection alarm device convenient to install

The utility model relates to the field of elevator safety, and discloses an elevator safety detection alarm device convenient to install, which comprises a cabinet, two sides of the cabinet are slidably connected with a plurality of extrusion plates, the inner sides of the extrusion plates are fixedly connected with telescopic spring support columns, the middle parts of the telescopic spring support columns are in threaded connection with opposite threaded rods, and the opposite threaded rods are in threaded connection with the extrusion plates. First bevel gears are fixedly connected to the middles of the opposite threaded rods, second rotating shafts are rotationally connected to the two sides of the top end of the cabinet correspondingly, first worm wheels are fixedly connected to the tops of the second rotating shafts correspondingly, and the first worm wheels are connected with the worm in an engaged mode. According to the device, elevator safety accidents caused by fast descending of the elevator are av