The utility model discloses a three-section type composite filter stick containing a harm reducing component. The three-section type composite filter stick is formed by sequentially combining a commonacetate fiber filter stick section, an acetate fiber filter stick section containing the harm reducing component and a common acetate fiber filter stick section, and the acetate fiber filter stick section containing the harm reducing component is composed of a common acetate fiber filter stick section loaded with an amylose grafted polyacrylic acid polymer material and/or a chitosan oligosaccharide grafted polyacrylic acid adsorption material. According to the utility model, three-section compounding is adopted; the amylose grafted polyacrylic acid polymer material and the chitosan oligosaccharide grafted polyacrylic acid adsorption material in the acetate fiber filter stick section containing the harm reducing component can absorb harmful substances such as ammonia and phenol in main stream smoke through hydrogen bond action or acid-base reaction, so that the purpose of reducing the harm of cigarettes can be better achieved.