Tobacco humectant and preparation method thereof

The invention relates to a tobacco humectant. The tobacco humectant is prepared from, by weight, 43-45 parts of propylene glycol, 33-35 parts of glycerin, 3-4 parts of cyclohexanol, 6-8 parts of seaweed polysaccharide, 1-2 parts of polydextrose and 8-10 parts of amino acid moisturizer. The invention further relates to a preparation method of the tobacco humectant. According to the tobacco humectant, through the utilization of substances which contain hydroxyl, amidogen, carboxyl and the like and can form hydrogen bonds and matching of quantity and ratio of hydroxyl groups, amino groups and carboxyl groups, a network membrane structure formed by bonding different groups through hydrogen bonds is formed on the surface of cut tobacco, and water molecules are also fixed in the network membranestructure due to the effect of the hydrogen bonds. The network membrane structure formed by the humectant can prevent moisture loss in a dry environment; in a moist environment, compared with commonly-used humectants such as