Cigarette filter stick

The utility model discloses a cigarette filter stick. The cigarette filter stick comprises a first filter unit, a functional unit and a second filter unit which are sequentially arranged from the farlip end to the near lip end, and further comprises forming paper wrapping the first filter unit, the functional unit and the second filter unit at the same time. Wherein the first filtering unit comprises a hollow first cylinder part and a first leakage-proof part, the periphery of the first leakage-proof part is connected with the inner wall of the first cylinder part, and the first cylinder partand the first leakage-proof part are integrally formed; and the functional units are filled with functional solid particles. In the cigarette filter stick, the first filter unit and the second filterunit are arranged on the two sides of the functional unit respectively, and therefore it is guaranteed that in the process that the cigarette filter stick is used for cigarette making, the functionalsolid particles in the func