The invention relates to the technical field of charging and power conversion, in particular to a power distribution system, a capacity sharing system, a master station, a sub-station, a method and equipment and aims to solve the problem how a charging facility is additionally arranged on the basis of capacity of a traditional power grid and achieve power optimization and utilization of the powergrid. The capacity sharing system comprises a terminal group, the master station and a server, wherein the terminal group comprises a first sub-station, a second sub-station and a guidance box, the master station is used for receiving power utilization data acquired by the first sub-station and a charging request acquired by the second sub-station in the corresponding terminal group ad calculatingand sending a charging instruction to the corresponding sub-station, the second sub-station is used for receiving the charging instruction of the master station and generating and issuing a control instruction to the guidance box, the guidance box is used for charging an output power of the charging facility according to the control instruction, the master station is further used for uploading charging service data to the server, and the server is used for judging a running state of a power distribution system according to the charging service data. By the capacity sharing system, electric energy sharing and ordered charging in a special region are achieved, and moreover, the system is more stable to run.