The invention discloses a power communication network and a capacity expansion and destroy-resistant routing path determination method thereof, and belongs to the technical field of communication. The power communication network comprises a client terminal, a centralized controller and multiple switches which support an OpenFlow protocol. Application of a software defined network enables power data communication to obtain a global network view, so that high quality of service is ensured. Information interaction is carried out between the centralized controller and the switches which support the OpenFlow protocol; when the power communication network requires capacity expansion or is in fault, a forwarding path is configured automatically, a processing delay is reduced, the capacity expansion speed and fault recovery are speeded up, the configuration error rate is decreased greatly, and consumption of the manpower resource is reduced.