Multi-stage sorting device for machine-made sand

The utility model belongs to the technical field of machine-made sand, and particularly relates to a machine-made sand multi-stage sorting device which comprises a primary sorting structure, a material distributing hopper is installed on the top of the primary sorting structure, a shell is arranged on the right side of the material distributing hopper, and a secondary sorting structure is installed in the shell. The shell comprises a connecting rod, a fixing ring, rotating shafts, springs and balance weight balls, the connecting rod is arranged on the inner wall of the shell, the fixing ring is installed on the outer wall of the connecting rod, the rotating shafts are arranged at the two ends of the connecting rod, the springs are installed on the outer wall of the fixing ring, and the balance weight balls are arranged at the ends of the springs; the machine-made sand sorting device has a vibration function, so that the two-stage sorting structure vibrates to cause movement of machine-made sand, the machine-m