The invention relates to a demand side optical storage integrated microgrid system control strategy. Given: PPG(t) is photovoltaic power generation output power, PESS(t) is energy storage system output power, Pload(t) is original load power, and Pgrid(t) is optical storage microgrid system and large power grid energy exchange. When PESS(t) is larger than 0, an energy storage system carries out discharging; when PESS(t) is smaller than 0, the energy storage system is charged; when Pgrid(t) is larger than 0, Pgrid(t) is equal to P'load(t), and P'load(t) is load power needed after a load in a microgrid is charged and called synthetic load power; when Pgrid(t) is smaller than 0, Pgrid(t) is equal to Pout(t), and Pout(t) is microgrid system output power, namely, electric selling to large power grid power. Energy losses of all parts of a system are ignored, it can be obtained that Pload(t)=PPG(t)+PESS(t)+Pgrid(t) through the law of conservation of energy and microgrid operation restraint, when Pgrid(t) is smaller than 0, the microgrid sells electricity to a large power grid, the microgrid system output power is Pout(t)=PPG(t)+PESS(t)-Pload(t), aiming at time-of-use electricity price and electrical load characteristics, and according to the energy storage contributing strategy basic principle, charging is carried out at valley value electricity price, discharging is carried out at peak value electricity price, and the electricity expenses are reduced.