The utility model relates to a power supply low -voltage intelligent system based on big data belongs to the magnetron reason field that supplies. The system compares module (3), low voltage comparing module (4), central control unit (5) and output module (6) including marketing geographic information GIS data storage with reading unit (1), user's power consumption information storage ware (2), radius of electricity supply. The utility model discloses a calculation to low -voltage customer power consumption data and distribution transformer load cooperates GIS information, confirms the scheme of solution low -voltages such as the transformer is transferred the files, load transfer, increase -volume, power supply line transformation, newly -increased transformer. Having overcome the tradition hysteresis quality and the random of the mode of lacking of disappearing of layouting, having satisfied layout efficiency maximize of transformer, design specifications ization realizes high -quality requirement of supplying power with less transformer. Can be for distribution network transformation, power supply scheme formulation, distribution optimal operation, join in marriage the reliable data of service provision such as power grid planning construction and support and combined data processing.