Side discharge type classer

The utility model relates to a side discharge-type grading machine, which solves the problems in the prior art, including high power consumption of the ball mill, batch feeding, high liability to cause material accumulation, and reduced work efficiency of equipment. The technical proposal to solve the technical problems is as follows: a sand return port is formed on the side face of a water trough, and a sand return lifting device is linked with the upper end of a left screw or a right screw. The utility model can be widely used in the production and use of grading machines, and can reduce the power consumption of the ball mill, simplify the structure and volume of the ball mill, reduce equipment cost, and beautify ore dressing environment.