Ball mill with non-cylindrical inner cavity wall

The invention discloses a ball mill with a non-cylindrical inner cavity wall. The ball mill comprises a frame, a cylinder body, a transmission belt and a driving device, wherein the inner cavity wall of the cylinder body is in a sectional irregular shape; the inner cavity wall of the cylinder body comprises a circular-section inner cavity wall arranged in the middle of the cylinder body, first elliptical-section inner cavity walls symmetrically arranged at the two sides of the circular-section inner cavity wall and second elliptical-section inner cavity walls symmetrically arranged at one sides of the first elliptical-section inner cavity walls; the long shafts of the section ellipses of the first elliptical-section inner cavity walls and the second elliptical-section inner cavity walls are perpendicular to each other; a first irregular inner cavity wall and a second irregular inner cavity wall are orderly arranged between the circular-section inner cavity wall, the first elliptical-section inner cavity walls and the second elliptical-section inner cavity walls to form transitional linkages respectively; and the inner cavity wall of the cylinder body is a cylinder inner wall of the cylinder body or an inner wall of an irregular rubber lining installed on the cylinder inner wall of the cylinder body. The ball mill disclosed by the invention has advantages of high ball mill efficiency, short ball mill cycle and low energy consumption.