Electric push rod

The electric push rod comprises an outer pipe, a telescopic connecting rod, a motor and a gear box, the gear box is arranged on a rear end cover of the outer pipe, an outer pipe plug is arranged on a front end cover of the outer pipe, a lead screw is connected into the outer pipe, a nut is installed on the lead screw, the nut is matched with the outer pipe in a rotation stopping mode, and the nut is fixedly connected with the telescopic connecting rod. The telescopic connecting rod penetrates through the outer pipe plug and extends out of the outer side of the outer pipe; a worm gear is arranged in the gearbox and fixed to the rear end of the lead screw, a motor shell is fixed to the gearbox, the motor is arranged in the motor shell, a worm is arranged on an output shaft of the motor, a wire hole is formed in the motor shell, and a power line of the motor penetrates out of the motor shell through the wire hole. A sealing ring and/or sealing sponge are/is arranged between the end, close to the gearbox, of the