The construction industry is booming, but construction projects will consume much non-renewable energy and cause environmental pollution. In response to this problem, this article establishes a low-carbon architectural design model and discusses the application of renewable energy decorative materials in modern architectural design in detail. Previous studies have shown that renewable energy decorative materials are widely used in ventilation design, thermal insulation design, interior design and lighting design, and the weights of carbon emissions in the use stage are 20%, 46%, 29% and 33%, respectively. In 2021, the usage weights of renewable energy decorative materials in ventilation design, thermal insulation design, interior design and lighting design will be 70%, 72%, 80% and 70%, respectively, far exceeding the usage of traditional materials.