The digital design method of the white body production line process includes production data modeling, process planning, production line simulation and optimization. The information from the input devices is entered into the production data modeling subsystem and modeled into a product engineering model. Through the process planning subsystem, the product engineering model is arranged for stations, steps, processes, and resources throughout the entire production line. Then, through the production line simulation and optimization subsystem, the various stations on the entire production line are simulated, optimized, and adjusted for welding, gluing, hemming, and other processes until an efficient and feasible product production line is obtained. This method can solve the problems of difficulty in synchronizing process planning with product development and long development cycles, thereby effectively shortening project cycles, reducing the time to market for products, saving investment in projects, and enhancing corporate competitiveness.