Abstract: A state of charge（SoC）equalization strategy of multi-energy storage system based on consensus algorithm is proposed for independently operating islanded optical storage DC microgrids containing multiple energy storage units.The average consistency algorithm of event-triggered control is used in improved droop control,each distributed energy storage unit（DESU）only needs to communicate with adjacent DESUs when the event-triggered mechanism is met to achieve SoC equalization. The system can improve the current distribution accuracy of different capacity storage units through this strategy,achieve SoC equalization and maintain the bus voltage stability,reduce the communication demand effectively while ensuring the control performance. The simulation model is set up in Matlab/Simulink,the simulation results verify the effectiveness of the the proposed strategy.