The structure of an automobile swing arm is analyzed and roll forging blank-making process with three passes by using aluminum alloys rod is put forward. With Deform-3D software, finite element simulation of the roll-forging process is conducted. Equivalent stress and strain field, temperature field and load of rolling die are analyzed. The main process parameters such as the temperature of blank, the temperature of die and the rotational velocity of die are optimized by applying the orthogonal experiment method, and certain theory reference is provided for process development and equipment selection of this kind of swinging arm.