Building muck rotary screen

The utility model discloses a building muck rotary screen which comprises a U-shaped supporting frame, penetrating openings are formed in the left side and the right side of the outer wall of the U-shaped supporting frame respectively, fixing rings are fixedly connected to the inner walls of the two penetrating openings, and an L-shaped supporting rod is fixedly connected to the left side of the outer wall of the U-shaped supporting frame. Material baffles are fixedly mounted on the front side and the rear side of the outer wall of the U-shaped supporting frame. In the utility model, under theaction of the screening mechanism II, when the movable plate rotates, the inner rack arranged on the inner wall of the concave cavity of the movable plate drives the gear II, and the gear II drives the gear III to rotate in the reverse direction opposite to the rotation direction of the movable plate; and the third gear extends into the movable plate through a connecting shaft to be connected with the inner screen drum,