An automobile hub bearing comprises a hub bearing body and an inflation device, the hub bearing body is composed of an inner ring (1), an outer ring (2), a main shaft (3), a
steel ball (4), a
retainer (5), a wheel side sealing ring (6) and an automobile body side sealing ring (7), and the outer ring (2) comprises an
air channel with an air inlet (21). The inflating device comprises a ventilation
pipe column (11) and a sealing component, the ventilation
pipe column (11) penetrates through a disc-shaped
flange (31) of the main shaft (3) and is connected with the disc-shaped
flange (31) in a sealing mode, and the sealing component is used for keeping the space between the inner side end of the outer ring and the disc-shaped
flange sealed. The sealing component comprises an outer ring inner
diameter inner side sealing mechanism and an outer ring outer
diameter sealing mechanism. The outer ring inner
diameter inner side sealing mechanism is a wheel side sealing ring of the hub bearing. The automobile hub bearing is simple in mechanical structure, low in manufacturing cost and high in
machining realizability, and the necessary waterproofness, airtightness and
gyroscopic moment of the whole device can be guaranteed.