The invention discloses a microgrid power supply quality evaluation and analog load balance control system and a method thereof. A microgrid power supply quality intelligent evaluator is used for solving the problems that there are a few evaluation indexes for microgrid power supply quality, the evaluation method is tedious and behindhand and the evaluation effectiveness is low. A power autonomousload-balancing algorithm is proposed by adopting a power balancer, and a power set value is evenly distributed into an analog load unit, so that the problem that the subsequent governance effect formicrogrid power grid quality evaluation is low is solved. A robust droop controller is added into an analog load decoupling control, the influences of microgrid alternating-current busbar voltage andfrequency fluctuation on analog load parallel system operation are balanced, and the robustness of system power following set value operation is improved. In the charging/discharging control of energystorage equipment, the two constraint conditions of microgrid power fluctuation and energy storage equipment protection are comprehensively stabilized, the constant power charging and discharging ofenergy storage equipment are maintained to the maximum extent, simultaneously, the energy storage equipment is protected, the service life of the equipment is prolonged, and the operating cost of thesystem is reduced.