The rear upper swing arm of a new energy vehicle chassis is produced by multi-pass forging using 30MnVS non-quenched and tempered steel, which requires a long process flows and long research and development cycle. Therefore, in order to improve the research and development efficiency of forging process, the main forming passes such as roll forging, billet making, pre-forming and final forming were calculated by numerical simulation method, and the mechanical performance parameters of 30MnVS non-quenched and tempered steel were calculated by JMatPro. Then, the DEFORM pre-processing automation program was used to perform the automated simulation calculations for multi-pass forging. Furthermore, by analyzing the macro-forming as well as temperature, damage, equivalent stress and equivalent sptrain field results of each pass, the potential defects were predicted, and the relative optimal operating speed during the forming process of each pass was obtained. The reliability of the simulation was verified by comparing the forming effect and defects of actual product. The result shows that the feasibility of material parameter calculation using JMatPro and automated forging simulation is proved, and this method can further improve the research and development efficiency of forging process.