Hub positioning tool for improving dynamic balance for lathe

The utility model discloses a hub positioning tool for improving dynamic balance for a lathe in the field of hub processing and manufacturing, which comprises a lathe chuck, a plurality of outer claws are arranged on the lathe chuck along the peripheral direction at equal intervals, a circular positioning component is mounted on the lathe chuck, and the axis of the positioning component coincides with that of the lathe chuck. The positioning assembly comprises a circular center disc and an annular outer frame which are coaxial, a plurality of reinforcing rib plates are arranged between the outer periphery of the center disc and the inner periphery of the outer frame in the circumferential direction at equal intervals in the radial direction, a plurality of inner clamping blocks are evenly distributed on the outer frame in the circumferential direction, and clamping parts are integrally arranged at the ends, close to the inner periphery of the hub, of the inner clamping blocks. The clamping parts extend close