The knife-roll straw cutters of this series are applicable to the pulp making company; they are used to chip the rice straw, wheat straw, kenaf whole stalk and some other raw materials. The feed part can drive separately, and can positive rotation and reverse in order to avoid chocking. The knife roll adopts rolling bearing, so is convenient in operation and maintenance. And the cutters can be divided into right hand machines and left hand machines according to the client's demand.