The invention relates to a power grid cost analysis and auxiliary review system and belongs to the technical field of an electric power system. The system comprises a data acquisition module, a data storage module, a central processing module and a cost analysis module, wherein the data acquisition module is connected with the data storage module and is used for timely storing the collected data information, the data storage module is connected with the central processing module and is used for carrying out operation processing of the stored power grid engineering data any time, and the central processing module is connected with the cost analysis module and is used for calling, summarizing and analyzing city power grid engineering data to form regional cost analysis accomplishment data. The system is advantaged in that a problem of low work efficiency is solved, deepening of cost analysis business can be effectively developed, the workload of business workers is reduced, passive treatment of the current cost analysis work is avoided, moreover, efficiency of review experts is greatly improved, and effective aids are provided for distribution of work tasks and collection of resultsmaterials.