The invention relates to the technical field of tobacco filter sticks and discloses a ternary tobacco fiber paper filter stick of composite moistening plants. The ternary tobacco fiber paper filter stick is composed of a filter element and a molding paper wrapped on the filter element, the filter element comprises two sections of tobacco fiber paper filter elements and a moistening plant filter element arranged between the two sections of tobacco fiber paper filter elements, the tobacco fiber paper filter element is reeled by paper fibers, and the moistening plant filter element is pressed by throat moistening plant particle. The ternary tobacco fiber paper filter stick is based on wet-method papermaking and enables tobacco fiber slurry and long fiber slurry to be mixed according to appropriate proportion in a papermaking slurry mixing stage, and the prepared paper filter stick has stronger tar and nicotine removal capability than cellulose acetate fibers, does not bring in miscellaneous gas, wet whistles and returns sweet. Raw material resources are natural plants, the ternary tobacco fiber paper filter stick has no paper or chemical fiber taste, the color of the ternary tobacco fiber paper filter stick is same with that of cigarette scraps, the ternary tobacco fiber paper filter stick has strong natural material texture of tobaccos, and guides a new research direction for the technical field of cigarettes.