High-temperature-resistant heat-insulating composite material and preparation method thereof

The invention provides a high-temperature-resistant heat-insulation composite material and a preparation method thereof, and belongs to the technical field of composite materials, the high-temperature-resistant heat-insulation composite material comprises the following specific components: 40-43% of vermiculite powder, 6-9% of silicon carbide, 12-17% of ceramic fiber cotton, 18-22% of polycrystalline mullite material and 12-20% of high-frequency ceramic, and the preparation method comprises the following steps: S1, proportioning: weighing the vermiculite powder, the polycrystalline mullite material, the high-frequency ceramic, the ceramic fiber cotton and the silicon carbide in sequence by weight; s2, mixing: sequentially adding the vermiculite powder, the polycrystalline mullite material, the high-frequency ceramic material, the ceramic fiber cotton and the silicon carbide weighed in the step S1 into a horizontal coulter type mixing machine, and carrying out second-stage mixing, so as to obtain a mixture A;