The invention discloses a method for preparing an electromagnetic shielding foamed aluminum composite material. The method includes the steps that a magnesium block and a hollow ceramics microsphere are added by stepping composition, then, after a pre-treated titanium hydride foaming agent is added, the surface is provided with a layer of dense oxidation film, thus the mixture can be foamed intensively in a certain temperature range, the effect of aperture decreasing is realized, and finally, a novel closed-cell foamed aluminum composite material is obtained. According to the method for preparing the electromagnetic shielding foamed aluminum composite material, the obtained closed-cell foamed aluminum composite material has the characteristics of being low in cost, small in aperture, highin strength, excellent in electromagnetic shielding performance and the like.