The invention discloses a slot carding filter stick, wherein a tow of the filter stick is wrapped in a piece of shaping paper; two to ten shred carding slots with smaller tow filling density are arranged in the tow of the shaping paper; and the shred carding slots axially run through the front and rear ends of the filter stick and are evenly distributed on the circumference of the filter stick. According to the technical scheme, the amount of diluted airflow entering the filter stick is increased, and by means of the increased diluted airflow, the density of the smoke is reduced; and due to the function of a negative pressure area in the filter stick, the smoke flows transversely in the filter stick and the filter efficiency of tar is improved; therefore, by means of the technical scheme, the tar content in the smoke is decreased and the density is effectively reduced under the condition of ensuring that the taste of the cigarette is basically constant.