Network management system and method based on software defined network

The embodiment of the invention relates to the technical field of networks, and discloses a network management system and method based on a software defined network. The system comprises a control layer and an infrastructure layer; the infrastructure layer comprises an access network, a government and enterprise private network and a cloud resource pool, the access network, the government and enterprise private network and the cloud resource pool are respectively connected with the control layer, the government and enterprise private network comprises a user unit and a service unit, the user unit is connected with the access network, and the service unit is connected with the cloud resource pool; the user unit is used for sending an interface address of an access network to the control layer; the service unit is used for sending an interface address of the cloud resource pool to the control layer; the control layer is used for controlling the user unit to configure the interface address of the access network