Lactic acid refining extraction process and application thereof

The invention relates to a lactic acid refining extraction process and application thereof, and belongs to the technical field of tobacco. The lactic acid refining extraction process comprises the following steps: S1, mixing lactic acid and water according to a certain mass ratio, adding the mixture into a rotary evaporator, carrying out rotary evaporation under the conditions that the first temperature is 75-85 DEG C and the first pressure is 215-225 mbar, and collecting a first rotary evaporation substance; and S2, after the rotary evaporation is completed, continuously carrying out rotary evaporation under the conditions that the second temperature is 90-105 DEG C and the second pressure is 15-25 mbar, and collecting a second rotary evaporation substance which is the refined lactic acid. The lactic acid refining extraction process is easy to operate, lactic acid with high purity can be effectively extracted, and after the refined lactic acid is added into cigarettes, the cigarettes are rich and full in fra