Vehicle-mounted elevator mechanism for construction site

The vehicle-mounted elevator mechanism comprises a main transverse plate, assembly through holes are longitudinally formed in the top face and the bottom face of the main transverse plate in a penetrating mode, a bottom frame sleeve frame is fixedly installed in the middle of the bottom face of the main transverse plate, and a servo motor is fixedly installed in the bottom frame sleeve frame; a coupler is installed at the output end of the servo motor. According to the vehicle-mounted elevator mechanism for the construction site, a servo motor and a coupler are arranged to drive a threaded rotating shaft, so that an inner threaded pipe longitudinally moves, namely, a treading operation platform, an auxiliary supporting plate frame and a connecting transverse supporting shaft are driven to longitudinally ascend and descend, and an operator can conveniently climb from the connecting transverse supporting shaft; the operation platform pad on the top surface of the operation platform is climbed in and treaded for