A self-adhesive film comprises a substrate layer and an adhesive layer on the substrate layer, which comprises a carboxylic acid-modified thermoplastic elastomer, a carboxylic acid-unmodified thermoplastic elastomer, a crosslinking agent and a plasticizer. A self-adhesive functional film comprises a substrate layer, an adhesive layer formed on one side of the substrate layer, and a functional layer on the other side of the substrate layer which has at least one of antireflective, electromagnetic wave blocking, heat ray cutting off, antistatic, anticlauding, antibacterial, deodorizing easy-adhering, antifouling functions and hard coat layer.