The invention discloses an extraction method of a micropore electric polarization coefficient and belongs to the technical field of electromagnetic shielding. The method comprises the steps that a shield model with holes is created in numerical calculation software in an electromagnetic field, and material properties and boundary conditions are applied; the intensity of an electric field on the micropore central axis in a shield is calculated and obtained through the software, the intensity of the electric field minus the intensity of an even electric field between plates, and the intensity of the electric field related to micropores is obtained; a result of the electric field intensity which is a certain distance from the micropore center is used as the intensity of the electric field which is suitable for calculation; the intensity of the electric field suitable for calculation is subjected to exponential fitting with the distance between a measuring point and a hole center, and the micropore electric polarization coefficient is obtained by using the fitting coefficient. According to the extraction method, the calculation of the micropore electric polarization coefficient of the shield with holes is achieved, the micropore shape is not limited, and in the shield model with holes and limited size, the micropore electric polarization coefficient can be obtained more accurately.