The invention discloses a data collection subsystem and method for a distribution network energy efficiency system. The data collection subsystem comprises a GPRS special network communication module,a prepositive server, an application server and a database server, and the prepositive server separately establishes communication with a distribution network master station and the distribution network energy efficiency system through the GPRS special network communication module; the prepositive server is used for forwarding collected power grid data to the application server, and sending the processed data fed back by the application server to the distribution network energy efficiency system; the application server is used for processing the received power grid data into data required bythe distribution network energy efficiency system, feeding back the processed data to the prepositive server and forwarding the data to the database server; and the database server is used for storingthe processed data and storing the processed data in a database in the database server. By adoption of the data collection subsystem and method disclosed by the invention, the difficulty of communication construction is reduced, the security of data transmission is enhanced, and accurate and real-time data are provided for the distribution network efficiency system with high efficiency.