The invention belongs to the field of power grid construction, and relates to an electric energy measuring system, in particular to an electric energy measuring system based on distributed power supply. The electric energy measuring system comprises a main station module, a transmission module and a collecting module. The collecting module is used for collecting electric energy data of all collecting points; the main station module is used for processing and storing data and controlling the collecting module; the transmission module is used for data transmission between the main station module and the collecting module. Compared with the prior art, the electric energy measuring system based on the distributed power supply has the advantages that data such as currents and the voltage which are collected by the collecting module is analyzed and calculated through a collecting control management unit of the main station module, the required accurate measuring data is further obtained, and the accuracy of electric energy measuring is further guaranteed.