Building waste crusher

The utility model discloses a building waste crusher. The building waste crusher comprises a shell, a crushing device, a discharging device and a dust removal device. The crushing device comprises supporting legs, a protective frame, a feeding hopper, a discharging barrel, a crushing barrel, a first motor, a chain wheel, a crushing roller, transmission shafts and a chain, the protective frame is fixedly connected to the top end of the shell, the crushing barrel is fixedly connected to the interior of the shell, and the three transmission shafts are rotationally connected to the interior of the crushing barrel. A second motor is started, the second motor drives a fixing shaft to rotate, the fixing shaft drives a crushing head to further crush crushed waste materials, the crushed waste materials are screened through a screen, and the screened crushed waste materials fall into a material collecting barrel along a material discharging barrel; the fixing shaft drives the transmission rod and the conveying auger to