The invention discloses a power distribution method for a parallel energy storage PCS. The method comprises the following steps: according to power scheduling commands from a power grid, determining whether the parallel energy storage PCS is operated for a discharging working condition or a charging working condition; carrying out weighted calculation on voltages and SOCs of energy storage batterypacks that are acquired in a real-time manner according to the operation condition of the parallel energy storage PCS; and carrying out active power and reactive power distributions on energy storagePCS units in the parallel system according to weighted calculation results and the power scheduling commands from the power grid. The power distribution method has the advantages that differences among the voltages and the SOCs of the storage battery packs are comprehensively considered; and the optimized active power and reactive power distributions are carried out on the energy storage PCS units, so that the maximum capacity utilization for the energy storage PCS units and the dynamic energy balance for the energy storage battery packs can be achieved in the parallel system, and the operation efficiency and the operation safety of the energy storage battery packs and the energy storage PCS units can be improved.