We researched transmittance and heat insulation effects in different concentration and thicknesses of aerogel coating glass. Then, we analyzed the advantages and shortcomings between the aerogel coating glass with dry and wet types. From the results of our research, we know that changing the material of the hot side thermoelectric power generating module of the solar light-thermal separator will improve the performance. Finally, we fabricated a solar light-thermal separator, and it works well under the sun.