The invention relates to the technical field of electric power data management, in particular to a professional data service system for electric energy loss. The professional data service system comprises a data server, wherein the data server is respectively connected with databases of a plurality of electric power business systems, and the data server is used for respectively establishing timing tasks, obtaining data needed by system analysis from the databases of the electric power business systems, transmitting the obtained data to a decision analysis system and carrying out data analysis. The professional data service system disclosed by the invention has the advantages that the working efficiency is high, the labor cost and the time cost which are occupied by data collection are low, and the using effect is good.