Material box unloading device

The utility model provides a material box unloading device which relates to the technical field of unloading devices and comprises a movable base and a plurality of supporting plates, the supporting plates are arranged on the movable base in a foldable mode, the end faces of every two adjacent supporting plates are hinged, and the end faces of the supporting plates are hinged to the movable base. A brake part is adjustably arranged below the movable base, the lower portion of one supporting plate is rotationally connected with one side of the movable base, a fixing plate is arranged on the side, away from the supporting plates, of the movable base, a buffer plate is arranged on the inner side face of the fixing plate, and a guide roller is adjustably arranged above the fixing plate through a transverse plate. The lower portion of the guide roller makes contact with the upper portion of a material box arranged on the movable base in a sliding mode, and guardrails are adjustably arranged on the two sides of the