Disclosed is a cosmetic dropper which includes a container main body having a container body in which a cosmetic liquid is stored and a cap part detachably coupled to the container body; a pipette coupling part coupled to the cap part; a pipette part having a pipette member coupled to the pipette coupling part, a piston coupling bar provided to elevate inside the pipette member, and a piston part coupled to an end of the piston coupling part to elevate together with the piston coupling bar and allows the cosmetic liquid to be suctioned into the pipette member or discharged to the outside reversely; and a separation prevention part coupled to the piston coupling bar so as to cover an outer wall of the piston coupling bar to prevent the end of the piston coupling bar from being separated to the outside of the pipette member.