A method of purifying an organic material using an ionic liquid according to the present invention includes a sublimation step (S510) of sublimating the organic material containing an impurity, a capturing step (S520) of bringing a sublimated gas of the organic material into contact with the flowing ionic liquid to capture the sublimated gas, and a recrystallization step (S530) of preferentially oversaturating the organic material, which is to be purified, of the sublimated gas, which is captured in the ionic liquid to be dissolved, to thus generate the recrystallized organic material. In the present invention, it is not necessary to perform a process of carrying the sublimated gas, which is generated during the sublimation step, to implement reverse sublimation. Accordingly, there is a merit in that the contamination of a purified sample by an inert carrier gas, which is used in a conventional sublimation purification method, is fundamentally avoided.