The diameter of the ore shaft at the discharge end of the overflow type ball mill is larger than the diameter of the hollow journal at the feed end, resulting in a height difference between the pulp surface of the feed end and the discharge end in the mill, which promotes the automatic overflow of the pulp from the discharge end. The overflow type ball mill is a new type of ball mill equipment with simple structure and self-flow discharge of ore. It is often used to grind fine ores. If multi-stage grinding is used, it is generally used in two-stage and three-stage grinding. Its cylinder body uses a high wear-resistant lining plate, which has the characteristics of good wear resistance, long service life and convenient maintenance.