Weightlifting device

The invention relates to a weightlifting device, which comprises a base, a supporting device, a first connecting shaft, a second connecting shaft, a first incomplete gear, a first bevel gear, a firsttorsion device, a second incomplete gear, a second bevel gear, a lifting structure and a holding rod, wherein the base comprises a base plate;the supporting device comprises two supporting rods and aplurality of transmission pieces; the first torsion device comprises an upper torsion cover, an outer torsion cylinder and a torsional spring; the lifting structure comprises a shell body, a verticalplate, racks and a supporting rod hole, the shell body is driven to move upwards when the holding rod is lifted by a hand; the first incomplete gear and the second incomplete gear are made to rotate reversely by means of the two racks; and then the first bevel gear and the second bevel gear are driven to rotate reversely, and the torsional spring generates torque. According to the weightlifting device, the torsional spring