Building waste crushing and screening device

The utility model belongs to the field of waste recovery, and particularly relates to a building waste crushing and screening device which comprises a crushing assembly, a conveying assembly and a rack used for bearing and fixing the conveying assembly and the crushing assembly. The crushing assembly comprises a fixed jaw plate, a movable jaw plate and a power piece, the fixed jaw plate is fixedly connected with the rack, the opposite surfaces of the movable jaw plate and the fixed jaw plate are arranged at intervals, the gap between the movable jaw plate and the fixed jaw plate is smaller under the gravity, and the power piece is used for driving the gap between the movable jaw plate and the fixed jaw plate to be expanded or narrowed; the conveying assembly comprises a conveying belt, the conveying belt is arranged below the crushing assembly, the conveying belt comprises a belt face and at least two belt shafts used for supporting the belt face, and holes are evenly distributed in the belt face; the rack fu