Engine piston

The invention discloses an engine piston. The engine piston comprises a piston body, wherein an annular clamping groove which is formed in the circumferential direction of the piston body is formed in the outer side wall of a head of the piston body; the depth direction of the annular clamping groove is consistent with the radial direction of the piston body; a sealing ring for sealing an opening of the annular clamping groove is fixedly inlaid at an opening of the annular clamping groove; the inner space of the annular clamping groove of which the opening is sealed by the sealing ring forms a piston coolant passage; and piston ring grooves formed in the circumferential direction of the sealing ring are formed in the outer side wall of the sealing ring. According to the engine piston disclosed by the invention, the processing difficulty of a piston coolant reservoir is effectively reduced, the long-time stable operation of the piston is guaranteed, the sealing performance of the piston is improved, and the se