▎ 摘　　要

NOVELTY - Preparing multilayer polyimide film with electromagnetic shielding ability comprises paving negatively charged cobalt iron oxide modified polyimide film and positively charged silver doped graphene powder in alternating order, paving each film, spraying a specific amount of deionized water on the film to wet the silver doped graphene powder, ultrasonically dispersing for 10-60 minutes, carrying out thermal imidization treatment, counting a layer of negatively charged cobalt iron oxide modified polyimide film and a layer of positively charged silver doped graphene powder as one layer, where the required number of film layers is in the range of 1-5 layers, and placing the film in an oven for thermal imidization treatment to obtain the finished product. USE - The method is useful for preparing multilayer polyimide film with electromagnetic shielding ability. ADVANTAGE - The method: improves adhesion and dispersibility of the silver-iron-graphene powder on the film modified by iron-copper-oxide; realizes self-consumption of the electromagnetic radiation in the film by the synergistic effect of the two; solves the problem of secondary electromagnetic radiation pollution; realizing the absorption and reflection capability of electromagnetic radiation with different intensity by changing the layer number of the alternating film; and improves the controllability of the shielding ability.