The invention relates to a processing treatment method for reducing the release amount of crotonaldehyde in cut stems. The cut stems are used as raw materials. The processing treatment method includes steps of 1), extracting the cut stems, to be more specific, extracting the cut stems by the aid of water, and separating solid from liquid after the cut stems are extracted so as to obtain extract liquid and residual cut stems; 2), fermenting the extract liquid, to be more specific, concentrating the extract liquid, then adding yeast into the extract liquid and carrying out fermentation treatment on the extract liquid; 3), adding fermented and treated extract liquid obtained at the step 2) into the residual cut stems obtained at the step 1); 4), drying the residual cut stems to obtain finished cut stems. The processing treatment method has the advantages that the release amount of the crotonaldehyde in the cut stems prepared by the aid of the processing treatment method can be obviously reduced, the cut stems can be mixed with cigarettes in formulas, and accordingly the release amount of crotonaldehyde in smoke can be reduced.