The invention discloses a security configuration verification device for performing a security configuration verification on a network device, which comprises: one or more preconfigured scanning policies; a scanning policy generator, which selects a scanning policy from the one or more preconfigured scanning policies to generate a new scanning policy corresponding to the network device; and a scanner, which performs the security scanning on the network device with the generated new scanning policy and thereby performs the security configuration verification. The invention also discloses a corresponding security configuration verification method and a network system employing the verification device.