The invention provides a composite hub bearing automatic cleaning machine to solve the problems that no special device for cleaning a composite hub bearing exists at present. The composite hub bearing automatic cleaning machine is characterized in that the whole composite hub bearing automatic cleaning machine is a cabinet body, an upper cover of the cabinet body is composed of a fixed cover body and a single-leaf sliding door, the single-leaf sliding door is driven by an air cylinder, a cleaning chamber is arranged below the single-leaf sliding door, a bottom plate of the cleaning chamber is of a hopper shape, a hub bearing fixing frame is arranged on the bottom plate, water and gas control valve water spraying nozzles and water and gas control valve gas spraying nozzles are arranged on the wall of the cleaning chamber in an upper-layer and lower-layer mode, the nozzles in the upper layer and the nozzles in the lower layer face towards the upper face of the hub bearing and the lower face of the hub bearing respectively, at least one filter screen is arranged below a water discharge hole of the bottom plate of the cleaning chamber, and a hopper and a water return pipe are sequentially arranged on the lower face of the lowest filter screen. The composite hub bearing automatic cleaning machine has the advantages of being high in cleaning quality and cleaning efficiency, and capable of recycling cleaning water, saving energy and protecting the environment.