In today’s accelerating urbanization, the development of intelligent transportation systems is becoming more and more important. The importance of transportation systems is becoming more and more prominent. Based on this situation, data security management becomes a core issue, especially the protection of data integrity, privacy, and reliability. In this study, blockchain technology is used to explore the method of applying blockchain technology to the data security management of intelligent transportation system. The application is carried out in the system data security management. The research focuses on how blockchain can be used for intelligent transportation system data security management by combining theoretical analysis and practical application. Blockchain realizes the functions of data storage, sharing, privacy protection, real-time processing, etc., and is applied in the fields of privacy protection and real-time processing. Through the above strategies, a more secure and effective intelligent transportation data management system is expected to be realized management system, etc. The research results show that blockchain technology can greatly improve data security and system anti-attack ability while maintaining efficient data processing and system stability. Maintaining efficient data processing and improving system stability.