Straw chopping device

The invention discloses a straw chopping device. The device comprises a feeding tube, wherein a plurality of rotating rods are arranged horizontally in the feeding tube from top to bottom, and two sides of each rotating rod are respectively provided with a plurality of blades at intervals; a platform, wherein an arc groove is formed in the upper end surface of the platform downwards, the bottom ofthe arc groove is provided with a plurality of first filter holes, and two sides of the arc groove located on the first filter holes are provided with a plurality of second filter holes; a bracket, wherein the bracket comprises vertical rods on the two sides of the arc groove on the platform and a horizontal rod located between the vertical rods, the horizontal rod is sleeved with a rotating disccapable of rotating around the horizontal rod and provided with a connecting rod, and the other end of the connecting rod is connected with a grinding disc located in the arc groove; a first sleeve sleeving the periphery of t