Provided herein is a portable air purifier. The portable air purifier includes: a body； first to third accommodation portions configured to have respective open top surfaces in order to separately accommodate a battery, an air compressor, and water； first to third covers configured to selectively open and close the respective open top surfaces of the first to third accommodation portions； an air inlet connected to the lower portion of the second accommodation portion, and configured to accommodate a pre-filter； a siphon pipe positioned upright inside the water of the third accommodation portion, and configured such that the top thereof is connected to the air outlet of the air compressor； a cannula installed on the top of the third accommodation portion, and configured to supply purified, humidified air to a user； and a power switch configured to control the amount of air to be supplied.
