The invention provides a power efficiency data classified storage method and system. The power efficiency data classified storage method comprises the steps of obtaining power efficiency data; classifying the electric power efficiency data according to the electric power efficiency data characteristics, the use characteristics and industry data indexes related to the energy-saving service, and constructing a storage unit according to the type; constructing an access method and a storage structure for each storage unit; and storing the power efficiency data according to a storage method and a storage structure. The method and the system divide and store data which is high in universality and relatively stable, and can effectively reduce the duplication degree of data storage in a database;according to the characteristics of industry energy consumption data, data such as special parameters and indexes of each industry are divided and stored according to energy-saving services, so that the energy consumption data of the industry can be used independently from other industries, the degree of correlation between the data can be reduced, and the scale of industry data sub-libraries is reduced. The invention also designs a standard library and a policy inventory standardization file and a policy file, so that a user can conveniently inquire related policies and standards, and a practical basis is provided for carrying out energy-saving consultation work.