The invention discloses an automobile aluminum alloy hub. The automobile aluminum alloy hub comprises a hub, spokes, a rim and a bottom groove; a bearing hole is formed in the hub, a nut hole is formed in the hub, and the hub is connected with the spokes; the spokes are connected with the rim, the bottom groove are formed between the two spokes, and a valve hole is formed in the bottom groove; a wheel shaft clamping groove is formed in the back face of the hub, and a locating plate is arranged in the wheel shaft clamping groove; the rim is provided with an outer clamping edge, a tire groove and an inner clamping edge. According to the automobile aluminum alloy hub, through the adopted hub with aluminum alloy material and compared with a steel hub, the specific gravity is reduced by one third, appearance and corrosion resistance of the aluminum alloy hub are further greatly improved, scratching by stones is not easy to occur, so that a tire is not easy to rust, appearance of the automobile hub is improved, and the service life of the automobile hub is prolonged; by adding the locating plate, uneven stressing during an automobile running due to displacing of the aluminum alloy hub and a wheel shaft during installing the hub is effectively prevented, and the precision during installing the hub is improved.