A flexible configuration method for service quality-oriented resources based on SDN and NFV establishes a smart substation resource flexible configuration model based on the software-defined network SDN and the network function virtualization NFV technology, and determines a resource allocation plan by comprehensively studying the cost consumption of alternative plans and the impact on the balanceof substation resources according to the resource flexible configuration model. The method proposes a terminal equalization factor indicator to measure the balance of equipment resource usage, and comprehensively quantifies the equilibrium of the substation by comprehensively considering the remaining processing capacity of the terminal, the remaining storage capacity, the terminal remaining inbound resource, the terminal remaining outbound resource and the total path consumption. The method designs the importance metrics, and considers both cost and equilibrium factors, so that the resourceallocation plan can meet the goal of ensuring the minimum cost in the substation equilibrium state.