A humidification and air cleaning apparatus comprising: an air clean module configured to receive external air and to filter the received external air; and an air wash module, separably placed on the air clean module to be supplied with filtered air from the air clean module, for humidifying filtered air characterized in that the air wash module comprises: a humidification connection flow passage to which the filtered air is provided; a humidification flow passage connected to the humidification connection flow passage for humidifying the filtered air therein; a discharge flow passage connected to the humidification flow passage for discharging the humidified air to the outside; a water tank configured to store water; an air wash inlet communicating with a humidification connection flow passage and guiding the filtered air to the humidification flow passage; a watering unit for spraying water stored in the water tank; and a water tank humidification medium disposed at the air wash inlet and configured to be spaced from water stored in the water tank, and wetted by water sprayed from the watering unit, wherein when the water tank humidification medium is wetted, the water tank humidification medium is configured to provide moisture to the filtered air flowing through the humidification flow passage. an air clean module configured to receive external air and to filter the received external air; and an air wash module, separably placed on the air clean module to be supplied with filtered air from the air clean module, for humidifying filtered air characterized in that the air wash module comprises: a humidification connection flow passage to which the filtered air is provided; a humidification flow passage connected to the humidification connection flow passage for humidifying the filtered air therein; a discharge flow passage connected to the humidification flow passage for discharging the humidified air to the outside; a water tank configured to store water; an air wash inlet communicating with a humidification connection flow passage and guiding the filtered air to the humidification flow passage; a watering unit for spraying water stored in the water tank; and a water tank humidification medium disposed at the air wash inlet and configured to be spaced from water stored in the water tank, and wetted by water sprayed from the watering unit, wherein when the water tank humidification medium is wetted, the water tank humidification medium is configured to provide moisture to the filtered air flowing through the humidification flow passage. a humidification connection flow passage to which the filtered air is provided; a humidification flow passage connected to the humidification connection flow passage for humidifying the filtered air therein; a discharge flow passage connected to the humidification flow passage for discharging the humidified air to the outside; a water tank configured to store water; an air wash inlet communicating with a humidification connection flow passage and guiding the filtered air to the humidification flow passage; a watering unit for spraying water stored in the water tank; and a water tank humidification medium disposed at the air wash inlet and configured to be spaced from water stored in the water tank, and wetted by water sprayed from the watering unit, wherein when the water tank humidification medium is wetted, the water tank humidification medium is configured to provide moisture to the filtered air flowing through the humidification flow passage.