High-sealing-performance heavy-load automobile hub unit

The utility model relates to the technical field of automobile hubs, in particular to a high-sealing-performance heavy-load automobile hub unit, which comprises a flange plate, and is characterized in that a wide inner ring part associated with the flange plate is sleeved on one side of the outer wall of the flange plate, a narrow inner ring part associated with the wide inner ring part is arranged on one side of the wide inner ring part, and the narrow inner ring part is sleeved on the flange plate. The outer wall of the wide inner ring piece and the outer wall of the narrow inner ring piece are jointly connected with an outer ring piece in a sleeving mode, one side of the outer ring piece and one side of the flange plate are jointly connected with an external sealing assembly, a gear ring is arranged at the center junction of the wide inner ring piece and the narrow inner ring piece, and one end of the lower portion of the gear ring is connected with a sensor assembly. The sealing performance of the whole h