Waste paper crushing device for carton processing

The invention belongs to the technical field of waste paper treatment, and discloses a waste paper crushing device for carton processing, which comprises a fixed bin, a material injection bin is fixedly arranged at the top of the fixed bin, and the waste paper crushing device further comprises a material injection assembly, and the material injection assembly is assembled in the material injection bin and is used for conveying waste paper. Waste paper is crushed through rotation of a crushing roller, a turbine drives an annular gear to rotate and an extrusion plate to rotate, the crushing roller continuously rotates to drive the extrusion plate to continuously rotate along with the crushing roller, paper scraps in a closed space are gradually compressed in the continuous rotation process of the extrusion plate, the size of the paper scraps is reduced, and the extrusion plate continuously rotates in the paper scrap compression process; and one end of a limiting plate is pushed to rotate around a hinge shaft, s