The invention provides a nanoscale thermal-insulation and noise-reduction tank interior composite material and a preparation method thereof. The composite material sequentially comprises a fluff layer, a base cloth layer, a composite layer 1, an aerogel felt, a composite layer 2 and a continuous basalt fiber layer, wherein the fluff layer is bonded with the base cloth layer through an adhesive; the thickness of the composite layer 1 is 0.2-2mm and the material is a polyurethane adhesive or a crylic acid adhesive; and the thickness of the composite layer 2 is 0.1-1.0mm, the composite layer can tolerate a high temperature of 300-500 DEG C and the material is any one of a polyimide adhesive, a phosphate adhesive, an organosilicone adhesive, an epoxy resin adhesive and a phenolic resin adhesive. The nanoscale thermal-insulation and noise-reduction flocking composite material has excellent heat preservation and thermal insulation effects.