The invention provides a heat-not-burn cigarette filter stick and relates to the technical fields of processing and manufacturing of cigarettes. The heat-not-burn cigarette filter stick comprises a tobacco section and a holder bar section, wherein the holder bar section comprises a cooling part, a mouth contact part and the like; the cooling part at least comprises a cavity structure, the sizes ofopenings in two ends of the cavity structure are different, the big opening end faces towards the tobacco section, and the small opening end faces towards the mouth contact part. In the smoking process, the tobacco section is heated, and the smoke flows through the tobacco section, is gathered and cooled at the cooling part and then flows into the mouth contact part. By adopting the heat-not-burncigarette filter stick, the concentration of the smoke is effectively increased, the temperature of the smoke is decreased, and the smoking quality of cigarettes is improved.