The invention discloses a software defined network (SDN)-based multi-controller dynamic deployment method, including the following steps: using a Paxos algorithm to select one controller as a master node from multiple controllers adjacent to a fault controller in the SDN, enabling the master node to acquire final immigration controllers corresponding to all switches managed by the fault controlleraccording to the topology structure of the SDN network, the load state of each following node, and messages sent in the process that the fault server and the master node are in synchronization, and then enabling the following nodes to execute an immigration process of the switches according to the obtained final immigration controllers corresponding to all the switches under the fault controller.The scheme of the invention solves the technical problem of increased average response time delay of the controllers caused by that in an existing multi-controller dynamic deployment method, capacitylimitation of the immigration controllers is not considered and the transmission distances between the switches and the controllers after the fault recovery are neglected.