The digital final assembly of spacecraft uses the three-dimensional model and bill of materials of the spacecraft assembly as the core carrier for design information transmission. The design intent and design parameters are intuitively and structurally reflected in the three-dimensional model and bill of materials. The three-dimensional model is used to directly guide the on-site production work of the spacecraft assembly, while also controlling the technical status. The digital assembly practice of a certain satellite has shown that the digital assembly of spacecraft has overcome the shortcomings of low efficiency, serial operation, and information dispersion in traditional modes, achieving parallelism, collaboration, and integration. The efficiency and quality of design and implementation have been significantly improved.