Hoisting device for fabricated building and using method of hoisting device

The invention discloses a hoisting device for a fabricated building and a using method of the hoisting device, and relates to the technical field of fabricated building installation. The device comprises a bottom plate, and a vertical supporting rod is vertically arranged on the bottom plate; a sliding block which moves up and down along the supporting rod is installed on the supporting rod, the auxiliary hoisting box is fixedly installed on the sliding block, and the sliding block is connected with a lead screw in the vertical direction in a meshed mode. A stepping motor is installed at the end of the lead screw and used for driving the lead screw to rotate. A second telescopic rod is fixedly installed in the auxiliary hoisting box, the free end of the second telescopic rod is fixedly connected with a second push plate with the set left-right width, bevel gears are fixedly installed at the two ends of the second push plate respectively, the bevel gears at the two ends are meshed with two sliding racks capabl