The invention aims at providing a device and method for carrying out reasonable and efficient distributive storage on big power data. According to the device and method for storing the large-scale power data, distribution characteristics, relevant to a power grid area, of the power data are utilized as the distributive basis of storage of the large-scale power data. The device comprises a power data distributive storage module, a mapping configuration module and a power data distributive management module. The mapping configuration module is used for layered division and node storage of the power data. The method correspondingly comprises a power data distributive storage process, a power data layered division and node storage mapping configuration process and a power data distributive management process.