A preparation method of strengthened aluminosilicate polymer composite material of stainless steel fiber web relates to a preparation method of strengthened aluminosilicate polymer composite material. The present invention solves the problem that the aluminosilicate polymer prepared by the existing method has bad mechanical property. The preparation method is as follows: firstly, aluminosilicate polymer ground paste is prepared; secondly, the stainless steel fiber net is processed; thirdly, the body of the stainless steel fiber net is prepared; fourthly, the strengthened aluminosilicate polymer composite material of stainless steel fiber web is prepared after the body is vacuum-pressed and dried. The composite material prepared in the invention has good mechanical property, the density of the composite material of the invention is 2 to 3 g/cm<3>, the flexural strength is 90 to 105 MPa, the elastic modulus is 10 to 15 GPa, and the tensile strength is 70 to 115 MPa; the composite material of the invention can be used at high temperature, is fire-resistant, corrosion-resistant, and does not release poisonous gas; and the preparation method of the invention is carried out at normal temperature, the preparation technology is simple, and the cost is low.