Macrocrystalline fused magnesite crushing system

The utility model discloses a macrocrystalline fused magnesite crushing system which comprises a first crushing device, the bottom of the first crushing device is fixedly connected with a screening box, an inner cavity of the screening box is fixedly connected with a first motor, and the output end of the first motor is fixedly connected with a cam. Supporting plates are fixedly connected to the two sides of an inner cavity of the screening box, springs are fixedly connected to the tops of the supporting plates, a screening net is fixedly connected to the tops of the springs, a lifting box is fixedly connected to the left side of the screening box, and a second motor is fixedly connected to the top of the lifting box; and the output end of the second motor is fixedly connected with a lifting roller. Through cooperative use of the first crushing device, the screening box, the first motor, the cam, the supporting plate, the spring, the screening net, the lifting box, the second motor, the lifting roller and the