Network security protection method, security server and forwarding device

The embodiment of the invention discloses a network security protection method, a security server and a forwarding device. The network security protection method comprises the following steps: receiving service data; loading network service corresponding to the service data; judging whether the network service satisfy a preset security rule; clearing data with security threat in the service data when the network service is unsatisfied with the security rule; and sending the secured service data without the data with the security threat to the forwarding device after the data with the securitythreat is successfully cleared. The embodiment of the invention can rapidly and accurately judge the security of the service data so as to protect terminals against the security threat and improve the security.