According to the overhauling and assembling process design method and the bogie overhauling and assembling method, an overhauling and assembling process module is independently established for each part, and the overhauling and assembling process modules of the required parts are combined to form an integral overhauling and assembling process. Each part overhauling and assembling process is modular, so that when overhauling and assembling process design and bogie overhauling and assembling are carried out, the overhauling and assembling process design of bogies of different types and differentoverhauling processes can be realized only by calling the modular overhauling and assembling process, and the process design workload is reduced.