Public broadcasting device convenient to install

The utility model relates to a public broadcasting device convenient to install, which comprises an installation seat and a second sliding block, installation holes are arranged on the top of the installation seat close to four corners, and the installation holes are matched with each other through a knob, a rotating shaft, a driving bevel gear, a driven bevel gear, a second worm, a second worm gear, a threaded pipe, a second threaded rod, a movable plate and a limiting block. A movable plate can move upwards under the limitation of a second sliding groove and a second sliding block through second threaded rods moving in inner cavities of adjacent threaded pipes, so that a limiting block fixed to the movable plate is inserted into an inner cavity of a limiting groove, the public broadcasting device body is conveniently installed, the using effect of the device is improved, and the practicability of the public broadcasting device is improved. Through mutual cooperation of the fixing groove, the servo motor, th