Provided is a natural eutecticevaporate solvent tobacco humectant and a preparing method and application thereof. The humectant is characterized in that the humectant is prepared from 10-15% of natural eutecticevaporate solvent, 0.1-0.5% of preservative, 0.1-0.5% of defoamer and the balance water and pH of the humectant is neutral. The humectant is applied to tobacco humidity preservation, through the cigarette humectant, not only can the degrading resistance property be improved, tobacco breakage is reduced, and the tobacco consumption of the cigarette in the manufacturing process is reduced, but also the taste and flavor can be improved, the effects such as smoke stimulation are reduced, and the effect of simultaneously improving the physical and sensory humidity preservation of the tobacco is improved. The natural eutecticevaporate solvent tobacco humectant and the preparing method and application thereof have the advantages that the natural eutecticevaporate solvent is simple in synthesis method, non-volatile, and nonflammable; synthesis materials are all natural products, are components contained in the tobacco, and are green and environmentally friendly; meanwhile, the synthesis materials are smoke fragrance precursors as well, have a certain effect on improving cigarette sensory fragrance, and have a potential popularization and application prospect.