Abstract: Based on the basic simulation tools such as aerodynamics software Fluent, system dynamics software Simpack and control software Simulink, this article implemented the development of digital simulation platform for rail transit mobile equipment. The article designed the framework of the system from the four layers of basic layer, application software layer, business layer and user layer to realize the overall control of the digital simulation platform, which had the functions of simulation calculation, graphics processing and data storage management, and through the study of theoretical calculation model, proposed a multidisciplinary joint simulation method. The new digital simulation platform not only has good universality, adaptability and expansibility, but also has certain application value to improve the design level of mobile equipment of rail transit in China and speed up the research and development rate of new vehicles.