A humidification and air cleaning apparatus comprising: a water tank to store water; a watering housing disposed inside the water tank to spray the water of the water tank; a watering motor to generate a torque; and a power transmission shaft disposed inside the watering housing to deliver a torque of the watering motor to the watering housing, wherein the watering housing comprises: a first watering housing spaced apart from an undersurface of an inner side of the water tank by a suction gap and having upper and a lower sides thereof opened, respectively; a second watering housing having upper and lower sides opened, assembled with an upper end of the first watering housing; a watering housing cover coupled with an upper end of the second watering housing to cover an upper surface of the second watering housing; and a power transmission unit disposed in at least one of the first watering housing, the second watering housing and the watering housing cover to receive a torque from the watering motor, wherein the power transmission shaft is coupled to the power transmission unit, wherein the power transmission shaft has an upper end thereof coupled to the watering housing cover, wherein the watering housing cover has a diameter larger than a diameter of the second watering housing and seals the upper side of the second watering housing. a water tank to store water; a watering housing disposed inside the water tank to spray the water of the water tank; a watering motor to generate a torque; and a power transmission shaft disposed inside the watering housing to deliver a torque of the watering motor to the watering housing, wherein the watering housing comprises: a first watering housing spaced apart from an undersurface of an inner side of the water tank by a suction gap and having upper and a lower sides thereof opened, respectively; a second watering housing having upper and lower sides opened, assembled with an upper end of the first watering housing; a watering housing cover coupled with an upper end of the second watering housing to cover an upper surface of the second watering housing; and a power transmission unit disposed in at least one of the first watering housing, the second watering housing and the watering housing cover to receive a torque from the watering motor, wherein the power transmission shaft is coupled to the power transmission unit, wherein the power transmission shaft has an upper end thereof coupled to the watering housing cover, wherein the watering housing cover has a diameter larger than a diameter of the second watering housing and seals the upper side of the second watering housing. a first watering housing spaced apart from an undersurface of an inner side of the water tank by a suction gap and having upper and a lower sides thereof opened, respectively; a second watering housing having upper and lower sides opened, assembled with an upper end of the first watering housing; a watering housing cover coupled with an upper end of the second watering housing to cover an upper surface of the second watering housing; and a power transmission unit disposed in at least one of the first watering housing, the second watering housing and the watering housing cover to receive a torque from the watering motor, wherein the power transmission shaft is coupled to the power transmission unit, wherein the power transmission shaft has an upper end thereof coupled to the watering housing cover, wherein the watering housing cover has a diameter larger than a diameter of the second watering housing and seals the upper side of the second watering housing.