Abstract: Micro-nano polymer spacecraft is a new type of spacecraft architecture that uses mechanical or electromagnetic locking mechanisms to connect modular spacecraft. It can flexibly achieve in orbit assembly and self-restructuring to meet different mission requirements. However, the electrical interconnection method based on traditional electrical connectors cannot meet the application requirements of flexible intersection, docking, and rapid separation between modular spacecrafts. In response to the above issues, this paper establishes power supply system architecture for micro-nano polymer spacecraft based on inductive coupled wireless power transfer. According to the ground demonstration verification requirements, the power supply system parameters for energy spacecraft module and payload spacecraft module are designed respectively. Then, based on the non-contact power supply requirements between modular spacecraft, the parameters of the bidirectional wireless energy transmission unit are designed. Finally, the feasibility of the power supply system architecture for micro-nano polymer spacecraft based on bi-directional wireless power transfer was verified through ground demonstration experiments. The transmission efficiency of the single-stage wireless energy transfer power remained stable at 75.8% or above when it reached 20-30W. By optimizing the efficiency to over 90%, multi-stage power transfer of four basic unit spacecraft could be achieved.