Aerogel sheet, preparation method thereof and thermal insulation material

The invention relates to an aerogel sheet, a preparation method thereof and a thermal insulation material. The preparation method of the aerogel sheet material comprises the following steps: providing mixed slurry containing sol and fibers; carrying out sheet forming on the mixed slurry to obtain a preformed sheet; carrying out gelation reaction on the preformed sheet to obtain a wet gel sheet; and standing and aging the wet gel sheet material, and carrying out supercritical drying to obtain the aerogel sheet material. According to the preparation method, the aerogel sheet is more uniform in forming, higher in flatness and better in colloid wettability, the two steps of sheet preparation and sol impregnation of the sheet are combined into one step, a mold does not need to be additionally customized, the thickness of the sheet can be freely regulated and controlled, the process is simple, operation is convenient, redundant mixed slurry can be recycled, and the production cost is reduced. And the processing cos