The invention discloses a message processing method applied in a high-performance scalable flow processing system framework. The firewall function of a service plate carries through security processing on the message received from an external device and then transmits the message to a main control CPU; simultaneously, as the message is transmitted to the external device by the main control CPU, the firewall function of the service plate also carries through processing on the message before being transmitted to the external device. The invention discloses a message processing device which is applied in the high-performance scalable flow processing system framework and includes an interface unit, at least one service plate and a main control CPU. By adopting the invention and utilizing the high performance and scalable characteristic of a new framework, in a large-flow high-speed network, firstly, the firewall function of the service plate carries through security processing and then the message is transmitted to the main control CPU. The main control CPU can be similar to the device at the back surfaces of other firewalls and get protection from the firewall, thereby effectively protecting the security of the main control CPU of the device.