Pneumatic clamping jaw

The invention relates to the technical field of industrial equipment, in particular to a pneumatic clamping jaw, comprising a base. The base is provided with a cylinder. The cylinder drives two floating jaws to be clamped with each other or one floating jaw to be clamped with a fixed jaw disposed on the base through a slider-crank mechanism. The slider-crank mechanism comprises a first connectingrod hinged to a second connecting rod, the hinge position is provided with a first sliding block sliding left and right in a first guide rail, the first guide rail is connected with a piston rod of the cylinder and driven by the piston rod, a second sliding block slides left and right in a second guide rail fixed on the base, and the floating jaws are fixed on the second sliding block. According to the pneumatic clamping jaw, the slider-crank mechanism converts the vertical cylinder thrust into the lateral clamping jaw clamping force, the clamping force=cylinder thrust*tan[alpha], when the [alpha] approaches 90 DEG, t