Secondary shredding device for corn stalks

The utility model discloses a secondary shredding device for corn stalks, which comprises a pair of trash-discharge rollers, wherein the trash-discharge rollers are arranged in a trash-discharge shell and rotate relative to each other, the downstream part of each trash-discharge roller is provided with a stationary knife apron, and a stationary knife is fixed on the stationary knife apron; and the secondary shredding device also comprises a movable knife apron which is rotatablely arranged at the downstream part of the stationary knife apron, wherein a plurality of movable knives are fixed on the movable knife apron, and gaps are left among the stationary knives and the movable knives. The secondary shredding device for corn stalks, disclosed by the utility model, can effectively improve the returning-to-field quality of stalks and facilitate the discharge of broken stalks, and also can avoid the condition that the broken stalks jam the trash-discharge rollers, therefore, the secondary shredding device for co