The invention relates to a model conversion proposal from mechanical-electrical transient to electromagnetic transient and an implementation method to realize simulated electric fence model conversion from mechanical-electrical transient to electromagnetic transient, in particular to an electric fence model conversion proposal and an implementation method based on mechanical-electrical transient simulation tool BPA to electromagnetic transient simulation tool PSCAD/EMTDC. According to incidence matrix of graph theory and depth first search theory, the method generates node branch incidence matrix based on the electric fence structure of BPA data documents, and determines the sequence of electric fence branch nodes by carrying out depth first search and combining the node branch incidence matrix until a complete branch of the electric fence structure is searched. According to the searched node sequence, the node branch incidence matrix is adjusted, and according to the new incidence matrix after adjustment, nodes, loads, branches and other electric elements are added until the reconstruction of all nodes and branches is completed and a new network model structure under the electromagnetic transient simulation tool PSCAD/EMTDC is formed. The network model structure has the same network topology as the electric fence structure of the original BPA data documents, and the parameters of all elements remain consistent.