The invention provides a simulation method and system for a large-scale scene of an electric power communication optical transmission network. The simulation method comprises the following steps: A: establishing a link model with transmission attributes, and simulating the optical transmission network by using the link model; B: simulating a fault; C: obtaining fault information, calculating a newservice forwarding path after network self-healing protection according to the fault information and pre-stored forwarding path information, and calculating corresponding new transmission attributesof the link model according to a new service forwarding path; and D: updating the link model according to the new transmission attributes. According to the simulation method and system for the large-scale scene of the electric power communication optical transmission network provided by the invention, the service forwarding path in the electric power communication optical transmission network is abstracted as the link model with small fluctuation of delay and error code, the self-healing protection of the fault in the electric power communication optical transmission network is abstracted as the switching of the link model, so that the simulation of the large-scale scene can be completed in a single simulation software.