The self-adhesive film has good self-adhesive performance, and the single-sided self-adhesive aluminum foil formed by compounding with the PET film can achieve reliable self-adhesion during wrapping, and achieve the functions of waterproof, moisture-proof and shielding. At the same time, due to the good compactness of the self-adhesive film, it can effectively make up for the pinholes on the surface of the aluminum foil, so that the double-sided self-adhesive aluminum foil after forming has better insulation, sealing and shielding properties, and at the same time greatly improves the product. tensile strength, and the return loss of the product is greatly reduced