Abstract: The spacecraft assembly location machine is one of the items for technical improvement of some spacecraft, and is one part of the cabin precision docking and disassembly technology. The numerical identification and the automatic control of the cabin docking and disassembly are implemented with the space position system and the automatic sling. This machine has the functions of the centroid capture, the automatic leveling, and the rotation control. It serves as the supporting platform, to adjust the spacecraft attitude, and to give the correlative data support. The design principles and the implementation methods of those functions are discussed in this paper.