The present disclosure relates to the field of materials, and discloses a gas-sensitive material, a preparation method therefore and an application thereof, and a gas sensor using the gas-sensitive material. The gas-sensitive material is a carbon material-metal oxide composite nanomaterial formed by compounding a carbon material and metal oxides, wherein the content of the carbon material is 0.5∼20 wt.% and the content of the metal oxides is 80∼99.5 wt.%; the metal oxides contain tungsten oxide and one or more selected from tin oxide, iron oxide, titanium oxide, copper oxide, molybdenum oxide, and zinc oxide; the metal oxides are formed on the carbon material in the form of nanowires, and the nanowires are tungsten oxide-doped nanowires. The gas-sensitive material has reduced resistance, is capable of responding to various gases at a reduced working temperature, also obviates the need for external heating, implements self-heating simply by Joule heating of a measuring circuit, and has reduced power consumption and increased sensitivity.