Automatic clamping pliers with adjustable clamping force

The utility model discloses a pair of automatic clamping pliers with adjustable clamping force. The pair of automatic clamping pliers comprises a shaft, a left rotating piece and a right rotating piece, wherein the left rotating piece and the right rotating piece are installed on the shaft through pins, a left plier opening and a right plier opening are respectively formed in the rotating ends of the left rotating piece and the right rotating piece, and a middle plier opening is formed in a position, which corresponds to the left plier opening and the right plier opening, of the shaft; cylindrical helical compression springs are respectively arranged on rotating arms of the left rotating piece and the right rotating piece; double-end studs are arranged in the cylindrical helical compression springs, and the double-end studs respectively penetrate through the left rotating piece and the right rotating piece and then are installed on the shaft; nuts are arranged on the outer ends of the double-end studs. Compared with the prior art, the pair of automatic clamping pliers has the advantages of simple structure, stability in operation, low cost, long service life, convenience in use and maintenance, adjustable clamping force and small integral structure, mechanics principles and mechanical principles are utilized, the failure rate is reduced, and the pair of automatic clamping pliers is very practical in occasions limited by structures.