Abstract: At present, the antiseptic coatings used for panel type radiators are mainly acrylic polyurethane coatings and epoxy antiseptic coatings. Their thermal conductivity and emissivity are low, which seriously affect the heat dissipation effect of radiators. In order to solve this problem, we proposed an improved measure of adding graphene to the coatings. Firstly, acrylic polyurethane coatings and water-based epoxy zinc-rich coatings with different graphene adding amounts were prepared. Then an experiment was carried out to measure and analyzed the thermal conductivity and emissivity of acrylic polyurethane coating and water-based epoxy zinc rich coating with different graphene content. Finally, based on the result of the above experiment, we took the panel type radiator for 10 kV oil-immersed transformer as the model to calculate the heat dissipation of the panel type radiator using graphene coating and acrylic polyurethane coating respectively by fluent simulation. The simulation results show that the heat dissipation of the radiator using the graphene coating is significantly higher than that using the acrylic polyurethane coating, and the heat dissipation effect of the radiator is significantly enhanced by the graphene coating. The research results can provide reference for the optimal design of the panel type radiator.