Crushing and screening all-in-one machine for building materials

The utility model relates to the technical field of building material recovery, in particular to a building material crushing and screening all-in-one machine which comprises crushing equipment and a screening assembly arranged below the crushing equipment, and the screening assembly comprises an outer frame serving as a main body and a screen installed on the outer frame and used for screening. The outer frame is obliquely arranged, a feeding box is arranged at the lower end of the outer frame, a conveying belt is arranged in the feeding box, an opening is formed in one end of the feeding box, and an auger feeding machine is arranged at the end, close to the opening, of the feeding box; the conveying belt and the auger feeding machine are arranged at the end of the screening assembly, large materials screened by the screen can be continuously conveyed back to the crushing equipment to be crushed again, manual carrying can be reduced, and the building material recycling device can be conveniently used in the