Building material crushing device

The utility model relates to the technical field of building materials, and particularly discloses a building material crushing device which comprises a box body, a feeding hole formed in one side of the top of the box body, a collecting box arranged at the lower part in the box body, a sealing door arranged at the lower side in front of the box body, and a crushing cavity formed in the box body, at least two crushing rollers are arranged in the crushing cavity, a discharging opening is formed in the lower end of the crushing cavity, and a rotating mechanism used for stirring materials in the discharging opening is fixedly arranged on one side of the discharging opening; a guide plate inclined towards the crushing rollers is arranged below the feeding hole; a screen vibrating in the horizontal direction is arranged between the collecting box and the discharging port. The device is good in dustproof effect, test manpower is saved, and test efficiency is improved; and the material passing efficiency of the disc