Overheating of the transformer reduces the service life of the transformer.In order to analyze the heat dissipation performance of panel-typed radiators, a typical product of the panel-type radiator is taken as the research object.A method combining Fluent numerical simulation research with experimental verification is used.The heat dissipation performance of radiator under oil natural circulation and oil forced circulation conditions is studied.Oil flow resistance and oil average temperature rising coefficient are used to evaluate heat dissipation performance of radiators.The results show that when the oil flow rate is constant, the oil average temperature rising coefficientof air forced cooling is reduced by 0.17 than air natural cooling and better in heat dissipation under oil natural circulation.In oil forced circulation, within the range of oil flow 45 m³/h to 65 m³/h, when the oil flow rate is increased, the oil flow resistance is increased by 4 kPa, the oil average temperature rising coefficient remains basically unchanged, about 0.198, the heat dissipation of radiator is increased about 8.8 kW, the heat dissipation performance of panel-type radiator is increased.The results provide guidance for the optimal design of the fin radiator.