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The thermal test of spacecraft has a large demand for the program-controlled power supply, and the power supply is configured in array. Its operation state is affects the reliability of spacecraft thermal test greatly. In this paper, the health management technology of program-controlled power supply is researched and Agilent N5750 power is used as the research object. Combining the analysis of the history fault type of power supply, the fault detection technology of power supply is studied. Then, combined with the technology of power supply redundancy switching, an on-line switching device is designed. Through the verification experimental, the experimental results show that this system can quickly realize the detection and positioning of the fault power supply, and can finish the online switching of the fault power supply to the backup power within the second-level time. The system can complete the fault detection and online switching in 3 seconds. The research enhances the health management efficiency of the large scale array power supply, and improves the operational reliability of the spacecraft thermal test.