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Energy management unit is the key component of satellite power supply and distribution subsystem to realize intelligent management and information collection. Constrained by the mechanical, electrical and thermal design of the small satellite, an energy management unit design based on the commercial System on Chip (SoC) is proposed, which can improve the functional density of the system and reduce the power consumption. Through detailed software redundancy strategy and system-level security mode design, the reliability of the system is not reduced although commercial device used. Nine satellite flights with orbital altitude of 500KM~1100KM show that the energy management unit designed in this paper has high integration, low power consumption and good stability. Compared with the traditional energy management unit based on single-chip microcomputer/PROM, the weight and power consumption are reduced by 75% and 85.3% respectively. The design is suitable for low-cost, batch production of small satellites.