Straw crusher

The utility model provides a straw crusher, belonging to the field of agricultural mechanical equipment. The straw crusher comprises a base, a bracket, a feeding hole, a discharge hole, a top roller, a front roller and a rear roller, wherein the top roller, the front roller and the rear roller are distributed in a shape like a Chinese character'PIN'; the circumference surfaces of the top roller, the front roller and the rear roller are respectively provided with grooves which are distributed along the circumference at equal intervals, and the depths of the grooves are the same as one another; when the top roller, the front roller and the rear roller are installed, the positions of the grooves formed in the surface of the top roller positioned at the upper part of the shape like a Chinese character'PIN' correspond to those of convex ribs arranged on the surfaces of the front roller and the rear roller which are arranged at the lower parts of the shape like a Chinese character'PIN'; the positions of the grooves formed in the surface of the rear roller correspond to those of convex ribs arranged on the surfaces of the top roller and the front roller. When the straw crusher is used for producing straw, the segmented straw is extruded and twisted, so that the obtained feed does not have sharp edge, bulge or burr and is suitable for animals to eat, the hurt of the conventional feed to the throat and the esophagus of an animal can be reduced and avoided, and a great help is provided for farmers raising animals.