Online maintenance system and method of distributed power supply

The invention discloses an online maintenance system and method of a distributed power supply. The online maintenance system comprises at least one accumulator unit composed of accumulators, an accumulator maintenance system, an environment control unit and a management monitoring center. The accumulator maintenance system comprises at least one accumulator maintenance module, a main control module and a communication module. The main control module is connected with the accumulator s through the accumulator maintenance modules. The accumulator maintenance modules are connected with the corresponding accumulator sets one by one. A discharging end of each accumulator maintenance module is connected with a load. A charging end of each accumulator maintenance module is connected with a UPS (uninterrupted power supply) through an AC (alternating current)-DC (direct current) conversion module. Through the communication module, the main control module is connected with the environment control unit and the management monitoring center respectively. The online maintenance system has the advantages that the local maintenance and the online maintenance of the accumulator sets performed by a remote administrative department are supported, operating maintenance quality and efficiency is greatly improved, and service lives of the accumulator sets are prolonged.