Abstract: The roll forging+final die forging process of a certain type of aluminum alloy automobile steering knuckle was analyzed. Numerical simulation of automobile steering knuckle roll forging+final die forging was carried out based on the professional forming software Deform. The results show that the complex shape of aluminum alloy automobile steering knuckle requires multiple roll forging preform forming; the maximum equivalent stress of aluminum alloy automobile steering knuckle roll forging+final die forging forming parts mainly appears in the contact parts of parting surfaces between the upper die and lower die; with the increase of friction coefficient, the maximum equivalent stress shows a gradual decreasing trend, while the maximum forming load of roll forging shows a gradual increasing trend.