An extrusion manufacturing process for a hub outer ring comprises the following steps of preheating of a die, die closing and pressurizing, pressure maintaining, secondary pressurizing and water cooling. The extrusion die is preheated to prevent molten aluminum from forming a hard shell on the surface of the extrusion die; in extrusion casting, continuous pressure can eliminate the defects of castings. In the pressure casting process, medium-frequency heating is carried out on the extrusion die continuously, solidification and crusting in the extrusion process can be prevented, and an extrusion head can be made to compress a crystallizing layer continuously, so that liquid-phase metal in a shell layer is pressurized to further eliminate casting defects. Secondary pressurizing can mend the surfaces of the solidified castings and overcome the defects of the surfaces of the solidified castings, and the quality of the castings can be greatly improved. Before final demolding, the die is rapidly cooled, the surfaces of the castings can be rapidly cooled and actively contract inwards to be extruded, and separation stress is generated between the surfaces of the castings and the surface of the die, so that the surface quality of the castings cannot be affected in the demolding process.