The invention provides a machine tool for machining a rim of a hub and belongs to the technical field of machines. The machine tool for machining the rim of the hub solves the problem of how to improve the machining precision while the machining efficiency of the outer surface of the rim is improved. The machine tool comprises a bed body, a pallet, a three-jaw chuck and a rotating motor. A clamping device is fixedly arranged on the three-jaw chuck in a clamping manner. A first stand column and a second stand column are fixedly arranged on the bed body. A tool holder is slidably connected to the first stand column. A turning tool is mounted and clamped to the tool holder. A mounting seat is slidably connected to the second stand column. A forming tool is arranged on the mounting seat. A forming portion is arranged on the outer surface of the forming tool. The pallet can move on the bed body in the transverse or longitudinal direction through a moving device so that a forming portion can be tangent to the outer surface of the rim or the turning tool can be tangent to the outer surface of the rim. According to the machine tool, by arranging the turning tool and the specific forming tool, the outer surface of the rim of the hub is roughly machined and finely machined through a turning and grinding combined machining manner, and the machining precision of the outer surface of the rim is improved while the machining efficiency of the outer surface of the rim is improved.