The invention relates to a polymeric membrane, and provides a waterproof, dustproof, light-transmitting and breathable keyboard membrane. The waterproof, dustproof, light-transmitting and breathable keyboard membrane comprises a substrate (1) and is characterized in that the substrate (1) is in a keyboard shape, the surface of the substrate (1) is coated with a protecting layer (2) which is a silica gel layer, the substrate (2) is made of a textile made of a composite fabric, the composite fabric is composed of a bottom layer, a middle layer and a surface layer, the bottom layer is connected with the surface layer into a whole through the middle layer, and the surface layer is mesh cloth. According to the waterproof, dustproof, light-transmitting and breathable keyboard membrane, the substrate is in the keyboard shape, the surface of the substrate is coated with the protecting layer which is the silica gel layer, the silica gel layer can effectively resist water and is convenient to clean, and therefore the waterproof and dustproof effect is achieved. The waterproof, dustproof, light-transmitting and breathable keyboard membrane has the light transmitting and breathable function.