Radiative cooling films are energy-efficient devices widely used in several domestic and industrial applications. To broaden its application in systems that require higher temperature requirements, this study designed low emissivity multilayer films using effective medium theory. The multilayer films obtained reflectivity greater than 0.99 at temperature regions of 207-362K, 580-960K and 1159-1932K. Combination of these basic films resulted in the bottom layer being significantly impacted upon during cooling radiation. Furthermore, the radiative cooling films with 6 periods, high refractive index ratio, and 0.014 μm root mean squared roughness achieved the optimal application effect and economic benefits.