The invention discloses a small base station control protocol and method adopting an SDN (software defined network) controller, and belongs to the field of wireless communication. The following two parts are mainly included: control protocol OpenSC for communication between the SDN controller and small base stations is provided specifically, complete control of the small base stations by the SDN controller is guaranteed, and control plane control is transferred to the SDN controller in an ultra-dense network; a method for controlling the small base stations by the SDN controller based on OpenSC protocol is provided specifically, and a user plane and a control plane of the wireless communication network are separated from each other, so that the flexibility of the entire wireless network and the throughput in the scene of the ultra-dense network can be enhanced. The network coverage and throughput are increased by introducing the small base stations, namely, ultramicro base stations, into the ultra-dense network; the densely distributed small base stations can be controlled in a centralized manner while the small base stations communicate simultaneously with the SDN controller through the OpenSC protocol as a secure data transmission protocol, and accordingly, the data volume carried by the network is greatly increased and signaling overhead is greatly reduced.