The invention discloses a screw-in device for mounting and overhauling a power transmission and transformation device. The screw-in device comprises a bracket, a worm wheel arranged on the bracket, and a worm matched with the worm wheel to drive the worm wheel to rotate, wherein a bearing for supporting the worm wheel is arranged in the worm wheel; the worm wheel is provided with a hexagonal through hole matched with an outer hexagon on a ground anchor; one end of the worm is connected with a first safety shaft coupling for switching the power off in case of overload; the input end of the first safety shaft coupling is connected with a motor serving as an automatic power supply or a rotating handle serving as a manual power source. A worm and worm wheel mechanism is arranged on the bracket, the ground anchor is connected to the worm wheel, and the ground anchor is screwed into or out of the ground surface in a manual way or an electric way through the rotation of the worm wheel; a safety shaft coupling protection mechanism is mainly taken as an integral device for protecting in case of running overload; a direct-current motor is taken as the power source of the integral device. By adopting the screw-in device, a safe screw-in function is realized, the working efficiency is increased, and the working quality is improved.