Model XQ140 hydraulic power pliers is suitable for unloading 23/8"-31/2" drill pipe, 31/2"-41/2" tubing and 41/2"-51/2" casing during oilfield workover operations. Both the main and back pliers adopt a three-jaw clamping mechanism, which has little damage to the pipe string, high operating efficiency, greatly reduces the labor intensity of workers, improves the thread connection quality of the pipe string, and reduces pipe string accidents caused by improper workover operations.