Under the dual carbon goal, the existence of microgrid plays an important role in promoting the construction of a new power system with a high proportion of new energy. The microgrid can be connected to the grid or operated in an island, and the microgrid operating in an island can effectively improve the reliability of power supply, and an appropriate control strategy can ensure the long-term safety and stability of the microgrid when it runs off-grid. In this paper, a research on the cooperative control strategy of islanding microgrid based on the energy storage state of charge is proposed. On the basis of the source-load power matching, the SOC of the energy storage system is divided into three intervals, and corresponding control strategies are formulated according to different intervals, according to the size of the SOC, the source load is dynamically adjusted to ensure that the energy storage as the main control unit is not overcharged or overdischarged, and the coordinated control of the microgrid in the island state is realized to ensure its long-term stable operation. Finally, the proposed control strategy is simulated and verified by Matlab/Simulink. The simulation results show that this method can effectively realize the coordinated control of the island operation, avoid the overcharge and discharge of the energy storage, and realize the safe and stable operation of the microgrid.