The invention provides an electromagnetic transient simulation method and device for a doubly-fed wind turbine generator. The method includes the following steps that: the operation parameters of a simulated doubly-fed wind turbine generator and the simulation parameters of a single unit model are obtained, wherein the simulation parameters include main circuit parameters and control parameters; apower amplification model is constructed based on the operation parameters and the simulation parameters of the single unit model; and electromagnetic transient simulation is performed on the doubly-fed wind turbine generator on the basis of the power amplification model. With the method and device of the invention adopted, the large-scale simulation of the doubly-fed wind turbine generator is realized; a simulation process occupies few resources; and simulation precision is high. According to the method and device of the invention, the steady/transient active and reactive characteristics ofthe power amplification model are consistent with the steady/transient active and reactive characteristics of the single unit model; and the power of the single doubly-fed wind turbine generator can be amplified by N times through the power amplification model; and a large-scale wind farm simulation model of thousands of megawatts or higher can be built with fewer power amplification models; and the requirements of large-scale wind farm transient analysis tests can be satisfied.