The invention relates to an aircraft tractor comprising a tractor body and an engine installed below the tractor body. An exhaust port of the engine is communicated with a filtering device for adsorbing particles in tail gas; the filtering device is detachably connected with a plurality of container bottles which are communicated with one another and are added with sodium hydroxide solution, the container bottles far away from the filtering device are communicated with a dryer for drying gas through pipelines, the dryer is communicated with a collecting box communicated with the inside of theengine, and an electric control valve is arranged between the engine and the collecting box; the container bottles are communicated with a liquid discharging device for discharging liquid, and the container bottles are all communicated with liquid inlet bottles for adding liquid. By adopting the technical scheme, the combustible substances in the waste gas are extracted by utilizing the solutionsin the filtering device and the container bottle, so that the combustible substances can be conveniently discharged into an engine to be recycled, and the advantages of energy conservation and emission reduction are achieved.