The invention discloses a method for obtaining an equivalent model and parameters of a power element based on a field-circuit combination, which is characterized in that the method comprises the following steps: Step 1, obtaining structural and dimensional parameters of the power element; Step 2, in the ANSYS three-dimensional simulation software,establishing the three-dimensional structure of thepower element model; Step 3, applying a low-voltage traveling wave test to the three-dimensional structure model of Step 2 to obtain a unit step response of the power element; Step 4, providing the qualitative equivalent circuit model of the power element according to the connection structure of the power element and other elements; Step 5, according to the principle that the qualitative circuitmodel obtained in step Step 4 coincides with the unit step response of the power element, determining the parameters of the qualitative circuit model of the power element. The invention effectively solves the problem that the simulation results caused by the previous power element model and the empirical parameters are quite different from the actual ones in the prior art.