The invention discloses a transformer simulation model establishing method and a transformer simulation model establishing system. The method comprises the following steps: establishing a grid model of a transformer; on the basis of the grid model, establishing a mechanism model of the transformer by utilizing a pressure-based solver, wherein the pressure-based solver includes a momentum equation, a turbulence model and an energy equation. According to the transformer simulation model establishing method and the transformer simulation model establishing system, the grid model of the transformer is established in advance, and then the mechanism model of the transformer is established by utilizing the pressure-based solver which includes the momentum equation, the turbulence model and the energy equation on the basis of the grid model, so that the grid model of the transformer is established, and the mechanism model of the transformer is also established by combining the pressure-based solver on the basis of the grid model; therefore, the established transformer simulation model has a better simulation effect.