The invention discloses a poly glucosamine hexanedioic acid vinyl ester additive for reducing the content of phenol type substances. The additive is a material which takes a granular porous material as a carrier and loads hydrophilic polycations on the porous material, and the hydrophilic polycations are poly glucosamine hexanedioic acid vinyl ester hydrochloride. The additive can be applied in the preparation of cigarette filters and reduce the phenol type harmful substances in cigarette smoke by utilizing the water selectivity in the additive; simultaneously, as a large number of flavor organic compounds can not be dissolved in water, the additive can avoid the loss of flavor components while reducing the phenol type harmful substances in the smoke and keep the inherent quality of cigarettes.