The invention belongs to the field of adhesives, and relates to an essence trapping agent applied to a flexible package steaming-resistant adhesive. By using the principle that iron or iron compounds and essence ethyl maltol can form stable complexes through coordinated complexation, ethyl maltol permeating into an adhesive layer can be coordinated, acidity of the coordinated ethyl maltol disappears, damage to the adhesive by ethyl maltol is eliminated, and adhesion to a packaging bag by the adhesive is ensured.