To provide a method and a device for collecting alcoholic components in an automobile exhaust gas, capable of thoroughly collecting alcoholic components in exhaust gas of a vehicle using alcohol fuel as an alternative to gasoline, and various alcohol included in exhaust gas from a bio-diesel fuel vehicle using bio diesel fuel as an alternative to light oil; and improving accuracy in analysis.

The exhaust gas from an engine E is led into a reduction reaction tank 3, and made to pass through a reducing agent (for example, oxalic acid) solution Sr in the tank. Thereby, mist-like alcohol is collected, and middle alcohol oxide is reduced to original alcohol to be collected in the solution Sr. Preferably, the exhaust gas after passing through the reducing agent solution is made to further pass through a solution of a derivative chemical reaction reagent (for example, 3, 5 -dinitro benzyl chloride), thereby collecting gas-like alcohol which could not be collected in the reduction reaction tank 3.