Disassembling and assembling device of smoke detector

The utility model relates to the technical field of disassembly and assembly of smoke detectors, and discloses a disassembly and assembly device of a smoke detector, which comprises a rotating rod with a telescopic structure, a supporting plate is arranged on the rotating rod, and the rotating rod is movably connected with the supporting plate. The upper end of the rotating rod penetrates through the bottom face of the supporting plate, extends to the top face of the supporting plate and is fixedly connected with a gear disc, the gear disc is driven to rotate freely by rotating the rotating rod, a first rack and a second rack are arranged in the supporting plate, and the gear disc is distributed in the center of the top face of the supporting plate. The rotating rod is rotated clockwise, so that the first rack and the second rack move towards the direction close to each other under the action of the gear disc, meanwhile, the first fixed tentacle and the second fixed tentacle are close to clamp the shell of th