The utility model provides a portable sampling case that keeps warm, includes the box, be equipped with the absorption bottle in the box, the absorption bottle includes bottle plug, intake pipe and outlet duct, the absorption liquid is equipped with in the absorption bottle, the intake pipe is below the absorption liquid liquid level, the outlet duct is more than the absorption liquid liquid level, be equipped with first hole on two opposite flanks of box respectively, the first downthehole rubber tube of having worn, the rubber tube is connected with the intake pipe and the outlet duct of absorption bottle respectively, be equipped with the heat preservation between box and the absorption bottle, the case simple structure that should sample, convenient operation, low price and portable under the low temperatures in the winter condition, can conveniently carry out the absorption of sample, and then carry out the analysis to the sample.