At present, the digital economy has emerged as a powerful new engine, driving growth and innovation in the modern world for economic growth. Data, as a core production factor, has become a basic strategic resource. However, the accompanying data security risks are increasing day by day. Security incidents such as data leakage and data abuse occur frequently, bringing serious security risks to personal privacy, enterprise trade secrets, and important national data. Data security has become the key to the healthy development of the digital economy. This project takes block chain technology as the core to build a complete set of cloud storage data security protection equipment with privacy protection, security and trustworthiness, and multiple data supervision and protection platforms. This technology will vigorously promote breakthroughs in key core technologies in the information field, safeguard the security of national information systems and key information infrastructure, and promote the construction of the core capabilities of national cyberspace security.