Building waste crushing device

The utility model relates to the technical field of building waste, and discloses a building waste crushing device which comprises a crushing assembly. A driving mechanism is arranged on one side of the top of the support; the crushing mechanism is arranged on the other side of the top of the bracket; a protection assembly is arranged at the top of the crushing mechanism and comprises a crushing mechanism; the fixing plates are symmetrically arranged on the two sides of the top of the crushing mechanism; according to the building waste crushing device, during use, an arc-shaped pipe is placed at the top of a crushing mechanism, movable rods are arranged on the opposite faces of the inner side of a fixed plate through bearings, mounting plates are arranged on the opposite faces of the two movable rods, and then the mounting plates are rotated to a plate body arranged at one end of the arc-shaped pipe; in this way, the plate body is fixed by rotating the screw rod, so that when construction waste is added into