▎ 摘　　要

NOVELTY - Polymer film comprises a N-layer surface graphene-formed polyimide film, where the N is an integer of more than 1. USE - Used as polymer film. ADVANTAGE - The polymer film has electromagnetic shielding function, high temperature resistance, corrosion resistance and bending resistance. The method is simple. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the polymer film, comprising (i) preparing a polyamic acid solution, (ii) providing a carrier, coating the polyamic acid solution on the carrier and performing imidization treatment to obtain a polyimide film and (iii) applying a laser to induce grapheneization of the surface of the polyimide film to obtain a surface grapheneized polyimide film.