In order to create a suitable thermal and humidity environment for crop growth in the solar greenhouse, a novel polystyrene foam modular double film solar greenhouse was designed and constructed. The double film solar greenhouse wall adopted polystyrene foam modules, with internal and external supporting frameworks and covering double-layer film, forming a thermal buffer zone which can collect and store solar energy passively. We tested indoor environmental factors variation of the double film solar greenhouse and the ordinary single film greenhouse in winter. Compared with the single film solar greenhouse, results show that the double film solar greenhouse effectively improves the indoor air, soil temperature and CO2 concentration, and reduces the indoor air humidity and soil humidity. The value of environmental factors of light, heat, water and air system in double film greenhouse is more stable than that in single film ordinary greenhouse. It provides a theoretical basis for the construction of double film solar greenhouse and indoor environment regulation.