In photovoltaic storage microgrid system, anti-interference ability of battery energy storage is weak, DC bus voltage fluctuation is large, and charging and discharging efficiency is poor. In order to solve these problems, a battery energy storage control strategy based on feedforward linear active disturbance rejection control method (FF-LADRC) is proposed. A mathematical model of bi-directional DC-DC converter is established. Based on the traditional closed-loop energy storage control of a battery, by introducing LADRC into the voltage loop and the current loop respectively, and adding a feedforward control in the voltage loop, the double-closed-loop control strategy is improved. Thereby the charging and discharging process in the battery energy storage system is controlled effectively. Simulation results show that the proposed control method can suppress the DC bus voltage fluctuation, and improve the charging and discharging performance of the battery energy storage system and reduce the overshoot of the energy storage system effectively.