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New space power supply with boost, depressurization and bidirectional energy flow has become a research hotspot and key technology of new type spacecraft. A 20kW space power with multichannel bidirectional half-bridge structural is designed in this paper, which has the following functions and features: simple topology structure, closed-loop controlled by PWM, voltage stepped up by Boost circuit or stepped down by Buck circuit. It can not only realize bidirectional energy flow, but also adapt to different working conditions. Under different input voltage, different output voltage can be selected and exported at constant value. It also has high voltage accuracy, small current ripple, high efficiency, small volume and weight, fault protection function and high reliability.