Vacuum insulating refractory product and preparation method thereof

The invention discloses a vacuum insulating refractory product and a preparation method thereof. The vacuum insulating refractory product is composed of a core material and a high-resistance film wrapped on the exterior of the core material, wherein the core material is formed by uniformly dispersing and then pressing 95-70wt% of low heat-conducting micro-pore powder and 5-30wt% of dispersed fire-resistant staples; a high-temperature resisting airtight film which is prepared from an inorganic material used as a main component in the manner of tape casting is served as the high-resistance film; the vacuum insulating refractory product is prepared after the pressed and molded core material is wrapped with the high-resistance film and then the vacuum hot-pressing packaging is performed; the product can be used under a temperature condition at 500-1200 DEG C, can maintain a vacuum structure and has ultralow thermal conductivity and high performance cost ratio; and the vacuum insulating refractory product is suita