RDF grading type crushing mechanism

The utility model discloses an RDF grading type crushing mechanism which comprises a base, a material receiving box is installed at the top end of the base, an installation frame is installed at the top end of the base, and a crushing box body is installed in the installation frame. Through the rolling box and the crushing box main body, when materials are mixed materials or hard materials, the materials are poured into the rolling groove from the first feeding hopper, and the first electric telescopic rod is started, so that the mounting plate and the rolling convex block extrude each other to crush the solid materials during repeated extrusion; materials meeting the requirements fall into the crushing box body through a through hole, a second discharging opening and a second feeding opening, the grinding mechanism is arranged, abrasion of cutters is effectively reduced, the work cycle is shortened, then a third motor is started, a second crushing cutter is driven to rotate, and then the second crushing cutt