Preparation method of silica aerogel and glass fiber mat composite material

The invention discloses a preparation method of a silica aerogel and glass fiber mat composite material. The preparation method comprises the following steps: glass fiber mat is placed in rolls or in a tiled form into an appropriate container; a novel ''two-step catalytic method'' of acid-catalytic hydrolysis and fluorinion catalytic condensation is adopted during sol-gel process of silica aerogel; the prepared sol-gel precursor solution is injected into the well-laid glass fiber mat, air in the glass fiber mat is exhausted, and gaps in the glass fiber mat are filled with the sol-gel precursor solution; the sol-gel precursor solution is gelated in the gaps of the glass fiber mat so as to obtain a glass fiber met-gel composite material, and the gelated glass fiber mat composite material is rolled-up again; and the rolled-up glass fiber mat and silica aerogel composite material is modified in an ethanol solution of hexamethyl-disilazane, and the gel composite material undergoes supercritical fluid drying to obt