Small lifting device used for electric power maintenance

The invention discloses a small lifting device used for electric power maintenance. The small lifting device comprises a bottom plate. The lower surface of the bottom plate is fixedly connected with four mounting blocks with the hollow interiors. The mounting blocks are uniformly distributed on the lower surface of the bottom plate. Threaded pins are inserted into the outer surfaces of the mounting blocks correspondingly and are in threaded connection with the threaded pins through threaded holes correspondingly. The ends, located in the mounting blocks, of the threaded pins are rotationally connected with first hinged seats through bearings correspondingly. According to the small lifting device, by arranging a driving motor, the driving motor drives a first threaded rod and a second threaded rod to rotate when adjusting of the working height causes variation of the center of gravity, two threaded sleeves are made to move close to or away from each other and drive supporting rods to open and close according t