Aiming at the requirements of data storage and sharing between side devices and among marketing distribution dispatching systems in cloud master station platform of power Internet of Things,a power data storage and sharing method based on blockchain and data lake is proposed. Firstly,the distributed power data storage architecture on edge layer is designed. Through ring signature and CryptoNote protocol,the data interaction between side device storage nodes is encrypted to realize the identity authentication of both parties,and the data sharing between nodes in power data security storage system is realized based on intelligent contract of blockchain. Then,the data sharing and access control model between the operation and dispatching platforms is constructed based on the data lake and the smart contract,in which the hash value of the data is stored in the blockchain,and the data is stored in the data lake,so as to realize the cross platform and cross domain secure sharing and access of data. Finally,an experimental platform is built to demonstrate the proposed method. The results show that the maximum storage delay time of the proposed method is short,and the throughput and security are also high,so it has a good application prospect.