Network guard method and system based on domain name

The invention discloses a network guard method and a system based on a domain name. The method includes the following steps: a core security gateway sends security policies to an edge security gateway, and the edge security gateway obtains access data, matches the security policies, guards information safety of a user with specified domain name, records safeguarding information, and reports the safeguarding information to the core gateway. According to the network guard method based on the domain name, the core security gateway sends the security policies to the edge security gateway, and the edge security gateway obtains the access data, matches the security policies, guards the information safety of the user with the specified domain name, records the safeguarding information and reports the safeguarding information to the core gateway. The method has the advantages that the network guard can be conducted with accuracy to the domain name.