The oil tank is the main heat dissipation component of the hydraulic system of garbage disposal equipment, and the heat dissipation performance directly affects the performance of the entire hydraulic system. By calculating the heat dissipation of the compression station in the garbage disposal equipment, the temperature rise curve of the oil under different ambient temperatures was obtained. A three-dimensional model of the fuel tank was established, and the Fluent module of ANSYS was used to simulate and analyze the temperature change curve of the fuel tank with or without graphene coating. The results show that under different initial temperatures, the use of graphene coating can reduce the temperature when the oil tank reaches thermal equilibrium, but has little effect on the time to reach the equilibrium temperature.