Abstract: In order to improve the efficiency of 3D design review of power transmission and transformation engineering and conform to the trend of digital transformation technology of power grid engineering, an intelligent fine auxiliary review system based on power grid big data is designed and implemented. Firstly, the proposed intelligent fine auxiliary review system model based on power grid big data and related technologies are described. Secondly, main system fuctions and deployment of the overall architecture, data architecture, business architecture and system architecture are described described. Finally, the engineering implementation of intelligent fine auxiliary review system based on power grid big data is illustrated. The intelligent fine auxiliary review system based on power grid big data can effectively complete the 3D review work of power transmission and transformation engineering design, further standardize the review business, improve the efficiency of review management, solidify the review process with information means, and realize the standardized and standardized management of 3D design results review business. It provides theoretical support for the State Grid Corporation of China to comprehensively promote the 3D digital management mode in the later period.