The invention relates to a preparation method of a high-temperature-resistant gas-sensitive material and belongs to the technical field of gas sensor technologies. The method comprises the following steps: taking corn straws, corn leaves and
rice hulls as raw materials and putting the same into
hydrochloric acid to soak and dissolve part of tissue fibers, separating the
plant fibers, corroding byusing
citric acid so as to modify a
fiber tube, so that the roughness degree of the tube wall of the
fiber tube is increased, meanwhile, introducing a large amount of carboxyl group chelating
zinc ions and generating nano-scale
zinc oxide molecules through the reaction of
diethylamine, adsorbing a large amount of
zinc ions by the
plant fibers through chelating so as to enable the generated nano-zinc
oxide to be embedded into the
plant fiber tube, and expanding to form holes, thereby increasing the contact area between the nano-scale zinc
oxide and the air, and then, carbonizing the plant fibers, so that the zinc oxide molecules exist in the carbon environment, and the zinc oxide is difficult to corrode by external substances, simultaneously, the heat-conduction
heat resistance of the carbon fiber is good, the
heat resistance of the gas-sensitive material can be obviously improved, and a good application prospect is achieved.