Electromagnetic shielding film preparing method

The invention provides an electromagnetic shielding film preparing method. The method comprises the steps that a carrier film layer is provided, and an insulating layer is prepared on the carrier filmlayer; conductive treatment is carried out on the insulating layer through vacuum plating; an insulating layer matrix after conductive treatment is placed in an alkaline electrolyte, and at least three times of electroplating sedimentation is carried out on the surface of the conductive matrix by using an alkaline liquor precipitation method to prepare a metal shielding layer; the metal shieldinglayer is placed in a micro-etching solution, and surface micro-etching is carried out to acquire a micro-etched layer; the micro-etched metal shielding layer is placed in an acidic electrolyte, and acid liquid sedimentation is carried out at least once to prepare a foamed metal layer; and a conductive adhesive layer and a protective film layer are sequentially prepared on the surface of the foamed metal layer to acquire a