With the development of electricity, electricity marketing data continues to grow, and traditional centralized data storage models have been unable to meet the security and efficiency requirements of power business data storage. Regarding the issue above, this paper proposed a multi-level encrypted electricity marketing data storage architecture based on blockchain. The storage architecture uses the blockchain as the underlying technical support combined with distributed storage to provide highly stable, secure and reliable power data storage performance. At the same time, a multi-level encryption mechanism is proposed on the basis of the blockchain. This mechanism supports step-by-step encryption and verification of power data on-chain and power data transmission processes, which further guarantees the security of power data storage. The paper compares the storage mechanism proposed in this article with the centralized storage mechanism by creating a distributed storage facility. The analysis of the experimental results shows that the storage mechanism proposed in this research has lower latency, lower response time and The advantage of higher throughput shows that the storage mechanism is reasonable and feasible and has good application prospects.