Abstract: The cybersecurity security of intelligent railway is an urgent problem to be studied. Based on the analysis of various cybersecurity security risks brought by high and new technology such as cloud computing in the era of intelligent railway, this paper expounded the necessity of carrying out research on cybersecurity security of intelligent railway, put forward the concept of hierarchical cybersecurity security, systematic cybersecurity security operation mode, cybersecurity security technical framework of horizontal isolation, vertical authentication, zoning and hierarchical protection, and built a security platform so that the technical architecture can be implemented on the ground. It has reference value for the planning and design of cybersecurity security of intelligent railway.