Air leakage prevention clamping device

The invention relates to the field of clamping, in particular to an air leakage prevention clamping device which comprises an air cylinder, a first clamping claw and a second clamping claw, the air cylinder comprises a cylinder block, a piston cavity is formed in the cylinder block, a piston is slidably connected into the piston cavity, a piston rod used for driving the first clamping claw and thesecond clamping claw to move is connected to the piston, a sealing ring is arranged on the cylinder block, a sealing ring groove communicating with the piston cavity is formed in one end of the cylinder block, the sealing ring is located in the sealing ring groove, a cover plate is detachably connected to the outer side of the cylinder block, and a through hole allowing the piston rod to penetrate through is formed in the cover plate. According to the scheme, the problem that the sealing ring on the air cylinder cannot be replaced is solved, so that the maintenance cost of the clamping deviceis lower. 本发明涉及夹持领域，具体涉及防