Abstract: At present, the power grid service data is stored in low data throughput, which leads to low storage rate. Therefore, the application of block chain technology in distributed storage management of power grid service data is studied. By analyzing the characteristics of smart grid data information and blockchain technology, the architecture of smart grid data management platform is reconstructed, and the technology of blockchain is embedded in the grid data management framework, the distributed storage, public-key cryptography, consensus mechanism and intelligent contract of blockchain technology are used to solve the problem of grid data storage and create a new ecological model of data optimization of smart grid. The overall framework of distributed storage management of power network service data is constructed, the management mechanism based on block chain technology is established, the security strategy of distributed storage management is determined, and the data distributed storage management is completed. The experimental results show that this method can effectively improve the throughput of data storage compared with the traditional management method, and has a higher application value for power enterprises.