Enhance the national security awareness of the whole people and build a people's defense line to safeguard national security. The national security concept of public libraries can give full play to the characteristics of rich library resources, large flow of people and strong influence, spread national security-related knowledge with the help of the advantages of library lending platform, enhance the national security awareness of the whole people, and build a people's defense line to safeguard national security. The concept of national security refers to a country's subjective understanding of its own security interests, which is the basis for a country to formulate security policies and has important strategic significance and policy orientation.