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Aiming at the shortcomings of the base station backup power system during use and the good application prospects of fuel cells, a design method of fuel cell energy management unit is proposed to complete energy conversion management for the base station backup power supply among utility power, lead-acid batteries and fuel cells. Power supply for the load is achieved pollution-freely, reliable and uninterrupted. The energy management unit is composed of power main circuit, control circuit, Hall sensor and software，the design of each main functional circuit and key components are analyzed from the perspective of hardware design, and the energy management strategy and software implementation process are described exhaustively. The developed test prototype has stable performance, the output voltage error is less than 0.15 V, the power error is less than 0.05 kW, and all parameters meet the requirements of the communication power supply standard. Fuel cell is a green, high-efficiency and energy-saving power generation equipment, and the management unit has a good application prospect in the field of base station backup power with the development of fuel cell technology .