The invention provides an assembling method and system of a bogie. The assembling method comprises the steps that according to user requirements, design standards and target parameters are obtained; according to the target parameters, the bogie type and the part type corresponding to the bogie type are determined, and a part module is obtained from a module library according to the part type; thetarget size of the part module is determined according to the design standards and the target parameters, and the part module is adjusted to the target size; and the part module is assembled. According to the provided assembling method and system of the bogie, the part module is obtained from the module library, the design standards and the target parameters are obtained according to the user requirements, the target size of the part module is determined, the part module is adjusted to the target size, and then the part module is assembled, so that assembling of the bogie is efficiently, quickly and conveniently completed; and repeated work for similar parts is avoided, and the production period is shortened.