The invention relates to a high-temperature-insulating material and a preparation method therefor and particularly relates to the high-temperature-insulating material, which has a
nano porous structure, prepared through forming an aqueous-phase uniform three-dimensional-network
nano porous structure by taking thixotropic
colloid as a template agent and adding a binding agent, aggregates,
powder materials, an
opacifier and admixtures. The preparation method for the high-temperature-insulating material, disclosed by the invention, is simple and easy in operation, low in production cost and environment-friendly and safe in process, does not need high-pressure special equipment, is free of combustible and explosive or other harmful substances and is beneficial to
mass production. The high-temperature-insulating material disclosed by the invention has the characteristics of light weight, high strength and low coefficient of
thermal conductivity, can be used for preparing high-temperature-insulating bricks, heat-insulating plates, special-shaped pieces and
coating materials and can be applied to the heat insulating protection of equipment such as high-temperature furnace hearths, pipelines and valves in the fields of
aerospace and military industries, metallurgical
forging,
petroleum refining,
electric power and the like, so that the safety of use and the level of energy saving and consumption lowering are improved.