A humidification type air purifier is disclosed. The humidification type air purifier comprises: a housing where external air is introduced to be discharged, having an inner space; a filter unit installed inside the housing to enable the introduced air to pass through the same to purify the introduced air; a water tank installed in the housing; and a humidifying unit installed in a lower portion of the water tank to receive water stored in the water tank. The humidifying unit can be configured to have a humidifying filter changing the purified air passing through the filter unit into the humid air.