Screw hoist with protection function

The utility model discloses a screw hoist with a protection function, which comprises a rack, a driving piece arranged on one side of the rack and a central screw penetrating from the upper part of the rack to the lower part of the rack, an adjusting component is arranged on the rack and comprises an electric push rod arranged on one side of the back surface of the rack, and the electric push rod is connected with the driving piece. The output end of the electric push rod is fixedly connected with a connecting handle, a rotating shaft is arranged below the connecting handle, an anti-freezing assembly is arranged at the bottom of the rotating shaft, the adjusting assembly further comprises a servo motor erected on the portion, close to the rear side, of the top of the rack, and the output shaft of the servo motor is fixedly sleeved with two belt transmission parts extending towards the two sides of the rack; the extension end of the belt transmission part is rotationally connected with a supporting rotating ro