Composite breathable film for buildings

The utility model discloses a composite breathable film for a building. Relating to the technical field of building materials, film comprising a film body, a third breathable layer is arranged in thefilm body, a first breathable layer is arranged on one side of the third breathable layer, a second breathable layer is arranged on the side, away from the first breathable layer, of the third breathable layer, a second anti-aging layer is connected to one side of the second breathable layer, and a first anti-aging layer is connected to one side of the first breathable layer. According to the utility model, the anti-corrosion layer, the top anti-corrosion layer, the side anti-corrosion layer, the first anti-aging layer and the second anti-aging layer are arranged; the anti-corrosion layer composed of the top anti-corrosion layer and the side face anti-corrosion layer is applied, the building film can be comprehensively protected, the anti-aging effect of a building is improved through thearrangement of the first a