In order to solve the problems of long data storage and weak data storage integrity in traditional methods, this paper proposes a secure storage method for energy big data centers based on blockchain technology. First, the big data of energy is statistically analyzed. Then, based on the security threats faced by the energy big data center in the storage process, assumptions were made, and a secure storage model of energy big data was constructed. Finally, combined with the process analysis of blockchain technology and the role of the system, a secure storage solution for the energy big data center is designed to realize the secure storage of the energy big data center. The experimental results show that the data storage efficiency of the design method in this paper is higher, and the data integrity coefficient is higher, indicating that the data storage performance of this method is better.