The invention discloses a liquid aromatic substance filling device for a cigarette filter tip. The liquid aromatic substance filling device comprises a cylinder body, a pressing type liquid pump and afilling pipe, wherein the cylinder body is provided with a cavity with an opening at least one end in a restricting mode, and the cavity is used for containing liquid aromatic substances; the pressing type liquid pump is arranged at the opening, the pressing type liquid pump is provided with an inner cavity, a liquid inlet, a liquid outlet and a pressing part, and the pressing part can move between the position of reducing the volume of the inner cavity and increasing the volume of the inner cavity; the rear end of the filling pipe is connected with the liquid outlet, the front end can be inserted into the cigarette filter tip, the pressing part is driven to move towards the volume of the inner cavity, and the liquid aromatic substances entering the inner cavity can be pumped out from theliquid outlet and flows into the filter through the filling pipe; and the pressing part is loosened so that the pressing part can move in the direction of increasing the volume of the inner cavity, and the liquid aromatic substance in the cavity flows into the inner cavity through the liquid inlet. According to the liquid aromatic substance filling device, the required fragrance and dosage of theliquid aromatic substances can be injected into the cigarette filter tip according to needs.