Waterproof and vapor permeable membrane is a high-performance flexible composite material that uses a sandwich structure to endow the product with multiple excellent comprehensive properties such as high strength, flexibility, waterproofing, and vapor permeability. This product provides soft protective sealing for the outer side of the door and window opening gap chamber, achieving functions such as preventing rainwater infiltration and exporting moisture inside the gap. Waterproof vapor permeable film, which adds hydrophilic groups to the polymer vapor permeable film, prevents water droplets from penetrating and allows water vapor to freely penetrate through the hydrophilic properties of the hydrophilic groups, ensuring the stability of the product's vapor permeable and waterproof performance and durability of its service life.