Cam tappet type engine

The invention discloses a cam tappet type engine. The engine comprises a cylinder sleeve fixedly arranged in an engine body, a piston arranged in the cylinder sleeve in a sliding mode and a piston rodwith the upper end connected with the piston, wherein a guide block used for guaranteeing the vertical movement stability of the piston rod is located and arranged at the position, below the cylindersleeve, in a cylinder body, a guide sliding hole in sliding guide fit with the piston rod is machined in the center of the guide block, the lower end of the piston rod penetrates through the guide sliding hole in a sliding mode and is hinged to a sliding block used for achieving power transmission, a cam shaft for converting power output by the piston rod into torque and outputting the torque isin abutted connection with the sliding block in a sliding mode, and the cam shaft is rotationally arranged below the engine body through a bearing cover. The engine is high in output power, low in vibration noise and free of pi