The invention discloses a switch network system which comprises an alarm device, a switch, a firewall, a master control module, a standby switch and a computer, and is characterized in that the switch and the standby switch are connected with an external network, respectively; the alarm device and the firewall are connected with the switch, respectively; the firewall is connected with the standby switch; and the master control module controls the switch, the standby switch and the computer, respectively. The invention aims at providing the switch system with relatively high safety and reliability.