Gear transmission device for pipeline cutting equipment

The invention discloses a gear transmission device for pipeline cutting equipment. The gear transmission device comprises a hydraulic motor, a gear reducing mechanism and an adjusting lifting mechanism, wherein a rigid sleeve is installed at the output end of the hydraulic motor, a coupler and a square shaft are arranged in the rigid sleeve, and the output shaft of the hydraulic motor drives the square shaft to rotate through the coupler; the gear reducing mechanism comprises a machine shell, a worm wheel shaft is installed on the upper portion in the machine shell, a worm wheel is installed on the worm wheel shaft, a worm meshed with the worm wheel is installed on the lower portion in the machine shell, and the worm is coaxially connected with the square shaft; and the adjusting lifting mechanism comprises guide lubricating sleeves arranged at the four corners of a lower box body, guide rods are installed in the guide lubricating sleeves, the lower portions of the guide rods are sleeved with buffer springs,