Automatic height adjusting device of traction machine

The utility model discloses an automatic height adjusting device of a traction machine, which is characterized by comprising a machine frame, a traction machine upper beam, a traction machine lower beam, a gear box support, a lead screw gear box, a guide rail and a guide block, the lead screw gear box is fixedly connected to the gear box support, the top end of a lead screw of the lead screw gear box is in threaded connection with the lower portion of the tractor lower beam, and the lead screw gear box is connected with a motor and comprises the lead screw, a first bevel gear forming a lead screw nut structure with the lead screw and a second bevel gear meshed with the first bevel gear. The second bevel gear is connected with an output shaft of a motor, the thrust bearing set bears the first bevel gear, the lead screw perpendicularly penetrates through the first bevel gear and the thrust bearing set, the lead screw is perpendicularly connected with the tractor lower beam, and a locking nut is arranged at the