The invention discloses a power big data system based on an intelligent power grid, and the system comprises a big data analysis platform, a power plant terminal, a transformer station terminal, and an intelligent community terminal, wherein the power plant terminal, the transformer station terminal and the intelligent community terminal are respectively connected with the big data analysis platform. The power plant terminal is used for collecting the power generation information in the power plant, and controlling an executing mechanism of power generation equipment. The transformer station terminal is used for collecting the power transmission and transformation information and controlling an executing mechanism of power transmission and transformation equipment. The intelligent community terminal is used for collecting the information of a smart home and controlling an executing mechanism of the smart home. The big data analysis platform is used for the controlling of instruction input, the loading and extracting of related data, data analysis and mining, the graphical displaying of analysis results and the generation of an analysis report. The system is objective and true in obtained big data, is high in accuracy, can determine a plan of optimal operation and load control, can achieve the reasonable formulation of marketing strategies of a power enterprise, can update regional energy development plans, and obtains external data of the power enterprise so as to obtain commercial values.