Piston ring fatigue testing machine

The invention provides a piston ring fatigue testing machine. The piston ring fatigue testing machine comprises a driving mechanism, a counting mechanism and a clamping mechanism, wherein the driving mechanism comprises a driving motor, the output shaft of the driving motor is connected with a flywheel, the flywheel is provided with two trapezoidal grooves, one end, close to the circle center, of each trapezoidal groove is fixedly provided with a primary ruler I-shaped block, one primary ruler I-shaped block is connected with a secondary ruler vernier through a fixing pin, a sliding block is fixed between the two primary ruler I-shaped blocks, the sliding block is provided with a through hole connected with one end of a connecting rod, the clamping mechanism comprises a movable bracket, a fixed bracket, a strip-shaped connecting rod and a linear guide rail, the movable bracket is connected with the other end of the connecting rod, the movable bracket and the fixed bracket are installed on the linear guide rai