The invention relates to a chemical special adhesive and a preparation method thereof. The chemical special adhesive consists of the following raw materials in parts by weight: 20-30 parts of organic silicon resin, 15-25 parts of acrylic resin, 3-6 parts of 2,6-ditertbutyl, 5-10 parts of MS modified silane, 2-6 parts of polyethylene polyoxypropylene polyether, 3-6 parts of magnesium hydrate, 3-5 parts of polyvinyl alcohol, 25-30 parts of silicone oil and 5-9 parts of deionized water. The chemical special adhesive has easily obtained materials, is non-toxic, harmless and environmentally friendly, and is high in adhesion, wide in application range, good in low temperature effect and high in stability, and resists high temperature and high pressure.