A laundry treating apparatus including a dryer including a first cabinet and a first drum rotatably mounted in the first cabinet; a washing machine including a second cabinet vertically disposed with respect to the first cabinet, a tub disposed in the second cabinet, and a second drum rotatably mounted in the tub; a refresher including a third cabinet disposed on one side of the first cabinet and the second cabinet, and having an inner space for receiving laundry; a heating device disposed under the tub and including a heat exchange unit for heating air supplied into the first drum and the inner space of the third cabinet; a drain pan which is disposed under the heat exchange unit and for storing condensate; and a drain pump for discharging water in the tub and the condensate in the drain pan.