Preparation process of fire-resistant composite board for suspension bridge anchor head

The invention discloses a preparation process of a composite board for fire resistance of an anchor head of a suspension bridge, and particularly discloses a preparation process of a basalt fiber reinforced silicon dioxide aerogel composite board for fire resistance of an anchor head. Comprising the following steps: cleaning and modifying basalt chopped fibers with hexadecyl trimethyl ammonium chloride, and dispersing the basalt chopped fibers in a polyimide solution; uniformly mixing tetraethoxysilane, absolute ethyl alcohol and water in proportion, then adjusting the pH value, stirring for 30 minutes to prepare silica sol, adding the basalt chopped fiber mixed solution into the silica sol, and adjusting the pH value to obtain a precursor solution; and standing the precursor solution at room temperature, soaking in ethanol in a grading manner, and drying through supercritical carbon dioxide to obtain the arc-shaped basalt fiber reinforced silicon dioxide aerogel composite board. Under the condition of consid