The invention discloses a malicious URL detection intervention system. The system comprises a DNS proxy device, a credit evaluation device and a traffic intervention device, wherein the DNS proxy device is suitable for receiving a domain name resolution request, requesting a domain name credit evaluation device for the credit of a domain name, and returning back an IP address of the traffic intervention device to a user if the credit indicates that the domain name has security risks; the credit evaluation device comprises a domain name credit library, and is suitable for returning back the credit of the domain name in response to the request of the credit of the domain name; and the traffic intervention device is suitable for receiving an access request from the user and performing protocol identification for the access request, and is also suitable for extracting a URL from the access request which is identified as a request of a HTTP or HTTPS protocol, matching the URL with a malicious RUL library, and if matching is failed, being used as a reverse proxy to realize communication of the user and a destination server. The invention also discloses a corresponding domain name credit determining apparatus, a corresponding domain name credit library establishing apparatus and methods.