Electric power marketing is the main content of the development of electric power enterprises, but in the process of power production, market changes and sales methods will have an impact on the sales results and reduce the effectiveness of power marketing. This paper suggests a data mining procedure to analyze power marketing, improve the development level of electric power enterprises, and shorten the time of marketing plan formulation. Then, a comprehensive assessment of the market data is conducted. Finally, continuous monitoring is used for power marketing and the final sales results are output. The results show that the data mining algorithm can perfectly transfer out power marketing, improve the glassy of power marketing, and the effectiveness is bigger than 95%, which is better than the market research method. The data mining process can meet the requirements of power marketing and is fit for the continuous study of the development of power enterprises.