The inconsistency in airborne 28 V series battery group will reduce their energy utilization and life, which even leads to flight accident. In this article, an energy equalization method based on a new equalization topology is proposed to improve the inconsistency of airborne lithium series battery group. The equalization topology uses the isolated DC-DC converter with simple structure and resistor to realize “peak clipping” or “ valley filling” of any single cell in the battery group. Compared with the non-centralized equalization topology, the number of equalization components and system volume are reduced. By using state of charge as the equalization variable, the energy transfer between cells in the airborne 28 V battery power supply is realized quickly. Compared with the centralized DC-DC topology, simulation and experimental results show that the proposed new equalization method can improve the equalization speed by 13. 3% , reduce the voltage range to 32 mV and SOC range to less than 0. 4% , and have faster and better equalization effect.