With the development and popularization of Internet, computer network has been widely used in various trades and fields. Computer network has been used frequently in daily office, management, life and service. For example, Government departments, institutions, enterprises, etc., the subsequent application of Internet technology has encountered some difficulties in practice, it is necessary for network problems in the application to improve, especially in network maintenance and security risks Therefore, the research and analysis on the maintenance and security management of the network are of great significance to further guarantee the network operation and work. In this paper, the author first describes the concept of network maintenance and security management, and then analyzes the application of network security management technology and the corresponding multi-level protection content; Finally, on this basis, pointed out that the current network maintenance and security management problems, And pointed out the perfect strategy for the new era of network development and maintenance to provide new ideas.