A DC/DC bidirectional active equalization circuit topology combined with fuzzy control theory is proposed for the problems of large number of lithium cells and serious inconsistency. Taking the state of charge (SOC) as the basis for equalization judgmentthe mean-difference method is used to carry out active equalizationwhich realizes the equalization of a single cell and the alternate equalization between multiple single cells. The simulation results show that the proposed cell active equalization strategy can effectively improve the inconsistency of multiple cells and has a fast equalization speedwhich effectively realizes the active SOC equalization among cells.