The invention discloses an OPNET-based intelligent substation network performance optimization method, and belongs to the technical field of intelligent substations. Wherein the intelligent substationnetwork comprises an intelligent substation network composed of concentrators and a DiffServ domain, the intelligent substation network is connected with the DiffServ domain, and the DiffServ domaincomprises a plurality of routers; the simulation method comprises the following steps: establishing a simulation model for an intelligent substation network system by utilizing an OPNET, and carryingout service configuration modeling by utilizing a service model; modeling a DiffServ domain by using OPNET, and simulating a multi-router by using eternet2 _ slip8 _ gtwy _ adv. According to the method, the network performance of the intelligent substation is optimized, the OPNET simulation platform is used for modeling and simulation, the result shows that the optimization method can improve thenetwork performance of the substation, and important reference suggestions are provided for network performance optimization of the intelligent substation.