The invention discloses a grinder for a cement road pavement. The grinder comprises a hollow casing and a grinding circular plate, wherein a connecting plate is fixedly arranged at the side surface of the hollow casing through a bolt; a longitudinal push rod is arranged at the center of one end surface of the connecting plate, and integrated with the connecting plate into a whole; a transverse push rod is arranged at the end part of the longitudinal push rod, and forms an integral structure with the longitudinal push rod; a power source placing space is arranged in the hollow casing; a storage battery is arranged in the power source placing space; a motor placing chamber is arranged in the hollow casing, and is positioned just under the power source placing space; a motor is arranged in the motor placing chamber; a threaded hole is formed in the hollow casing and is used for communicating the interior of the motor placing chamber and the outside. The grinder has the advantages that the to-be-dried cement road pavement can be subjected to primary rotary extrusion, and then subjected to rotary grinding; the grinding time of the cement road pavement is effectively shortened, and the labor intensity is decreased in the working process.