The absorption rate of solar energy can be improved by combining the photothermal conversion material with glass to make solar photothermal conversion film on glass.The composite coating material of Cu7S4 was prepared by sol-gel method,and a nano-scale composite coating with photothermal conversion function was formed on glass.Under the premise of ensuring the transmittance,the prepared solar photothermal conversion film on glass has uniform coating,good stability,strong bonding force with glass,and good heating effect.