A gas-extraction hole-sealing material is composed of dual components A and B. The component A is polyisocyanates. The component B comprises: by volume, 28-30 parts of hard-foam polyether, 15-17 parts of high-resilience polyether, 5-6 parts of stable polyether, 8-12 parts of polyaspartic acid ester, 20-28 parts of a fire retardant, 2-3 parts of a foam stabilizer, 2-3 parts of amine-terminated polyether, 5-6 parts of a foaming agent, and 5-6 parts of a catalyst. When in use, the component A and the component B are used according to the volume ratio of 1:1 to be mixed in a gas-extraction sealing hole through a grouting pump, so as to form a compact seal coat. In comparison with polyurethane, the Gutejie composite material has better mechanical strength, wear resistance, corrosion resistance, oil resistance, water resistance, aging resistance and temperature cycling and compression resistance, will not contract, is not sensitive to water and moisture like polyurethane, and is not easily influenced by environmental temperature and humidity during construction.