In this study, the UV/VIS/NIR spectrometer and textile thermal insulation test bench were used to analyze the energy saving of curtain fabrics. Explore the correlation between the SHGC obtained by ISO 52022 and the thermal insulation temperature rise. Afterwards, the simulated solar energy-saving test house was used to verify the air-conditioning energy consumption, indoor lighting, curtain surface temperature and space temperature heating characteristics of curtain fabrics. The test results show that the SHGC measured by the spectrometer correlates with the thermal insulation temperature rise measured by the thermal insulation test bench. In the verification of the solar energy-saving test house, it is indicated that the installation of internal curtains has a certain thermal insulation effect. The maximum air conditioning energy consumption can be reduced by 68%.