The utility model discloses a double-layer hub rolling device, and belongs to the technical field of wheel hubs. A hub is a hollow cylinder, outer bearings are arranged at the two ends inside the hub respectively, first flat gaskets with the diameter larger than that of inner sleeves are arranged at the right ends of the inner layers of the outer bearings, locking nuts are arranged on the right sides of the first flat gaskets, through holes are formed in the locking nuts, and first cotter pins are arranged in the through holes. The corresponding inner sleeves are installed at the inner two ends of each outer bearing respectively, inner bearings are arranged at the two inner ends of each inner sleeve respectively, and middle shafts are installed in the inner bearings. A left end cover is arranged on the left side of the hub through bolts, and a through hole with the diameter larger than that of the middle shafts is formed in the center of the left end cover. A boss for performing limiting is arranged at the left end of the middle shaft to limit the inner bearings, a threaded rod with the diameter smaller than that of the middle shaft is arranged at the right end of the middle shaft, second flat gaskets are arranged on the inner layers of the inner bearings, a shaft nut is screwed in the threaded rod, and the shaft nut is provided with a through hole internally provided with a second cotter pin. A right end cover is arranged at the right end of the hub through bolts.