Piston ring clamp including handles, connecting rod, transmission rod, a fixed rod, coat and clamping sleeve, one end of the handle has described rotary table, described in the turntable by connecting rod connected to the transmission rod activities described, described wheel sets used in fixed axle pin, described the coat for the hollow cylinder, described lever located within a stated coat, described the fixed rod used to drive the clamping sleeve located within a clamping sleeve described sliding inside the coat, and described the fixed rod fixed transmission rod and stated, described in the conflict with the mentioned clamping sleeve, transmission rod mentioned at the end of the clamping sleeve is equipped with four clamping piece, equal spacing between adjacent clamping piece, and four clamping piece assumes the circular distribution. The utility model piston ring clamp has simple operation and is convenient to use.