The invention provides an SDN multi-area network device based on dual-port switches and a realization method. The device comprises an SDN general controller and multiple network communication modules in link connection, wherein each network communication module at least comprises one main controller, an SDN auxiliary controller and a plurality of dual-port switches; and the SDN main controller and the SDN auxiliary controller are connected with the upper-layer SDN general controller respectively. Through building the network communication modules, network areas are divided; the link fault between the SDN main controller in the network communication module and the dual-port switch is processed, and when fault happens to a certain network communication module, another area is connected automatically through the dual-port switches in the network area, and cross-area communication is realized. Normal operation of the device in a condition in which a plurality of links in the network fail and even a certain SDN controller fails can be ensured.