Disclosed is an apparatus for separating gas and liquid. The apparatus for separating gas and liquid includes a housing, a rotating shaft provided inside the housing, a drive unit configured to rotate the rotating shaft, a rotating cone mounted at the rotating shaft to rotate about the rotating shaft and having a diameter decreasing from an upper end to a lower end thereof, and a fixed cone formed by coupling at least two first unit members in a circumferential direction of the rotating shaft, disposed in the housing to be spaced apart from the rotating cone and having a diameter decreasing an upper end to a lower end thereof.