With the gradual deterioration of the environment and the depletion of natural energy, energy-saving and environment-friendly green building materials are considered as important development direction in many countries. In addition to the substantially reducing in building materials, the use of photovoltaic vacuum glazing (PV-VG) in buildings will lead to a gradual reduction in energy consumption / operating costs and carbon dioxide emissions. In this paper, the transmittance of a photovoltaic vacuum glazing is simulated. In addition to transparent conductive glazing and aerogel, there are three functional films: TiO2 nanocrystalline photocatalytic film, amorphous / microcrystalline silicon film and Low-e film are applied. TiO2 film has the advantages of high catalytic activity, good chemical stability, and self-cleaning of glazing. Amorphous / microcrystalline silicon films can absorb infrared light and visible light partially to generate electricity. The low-e film can reflect the infrared light that is not absorbed by the photovoltaic layer. At the same time, it can also block far-infrared rays, thereby enhancing the thermal insulation of glazing. During the simulation process, the geometrical optics physical module of Comsol software is used to study the ray tracing, as well as a series of settings such as geometry structure, material, and dielectric properties that established the permance and ray release range of photovoltaic vacuum glazing. In the simulation, the incident light has a wavelength in the range of 400nm to 800nm. Finally, the absorption coefficient and transmittance of different films were obtained.