A beverage maker comprising: a water supply module configured to supply water; an ingredient supplier connected to the water supply module through a first main channel; a fermentation module connected to the ingredient supplier through a second main channel and configured for mixing ingredients from the ingredient supplier with water; a beverage dispenser connected to the second main channel; and a sub channel connecting the water supply module to the beverage dispenser; wherein the beverage dispenser comprises: a dispenser configured to dispense the beverage; and a beverage dispensing channel which connects the dispenser to the second main channel, the sub channel being connected to the beverage dispensing channel; wherein a beverage dispensing valve configured to open and close the beverage dispensing channel is installed in the beverage dispensing channel, and the sub channel is connected to the beverage dispensing channel between the beverage dispensing valve and the second main channel or between the beverage dispensing valve and the dispenser; the beverage maker further comprising: a drain channel connected to the beverage dispensing channel at a portion between the dispenser and the beverage dispensing valve among to communicate with the outside; and a drain valve installed in the drain channel and configured to open and close the drain channel. a water supply module configured to supply water; an ingredient supplier connected to the water supply module through a first main channel; a fermentation module connected to the ingredient supplier through a second main channel and configured for mixing ingredients from the ingredient supplier with water; a beverage dispenser connected to the second main channel; and a sub channel connecting the water supply module to the beverage dispenser; wherein the beverage dispenser comprises: a dispenser configured to dispense the beverage; and a beverage dispensing channel which connects the dispenser to the second main channel, the sub channel being connected to the beverage dispensing channel; wherein a beverage dispensing valve configured to open and close the beverage dispensing channel is installed in the beverage dispensing channel, and the sub channel is connected to the beverage dispensing channel between the beverage dispensing valve and the second main channel or between the beverage dispensing valve and the dispenser; the beverage maker further comprising: a drain channel connected to the beverage dispensing channel at a portion between the dispenser and the beverage dispensing valve among to communicate with the outside; and a drain valve installed in the drain channel and configured to open and close the drain channel. a dispenser configured to dispense the beverage; and a beverage dispensing channel which connects the dispenser to the second main channel, the sub channel being connected to the beverage dispensing channel; wherein a beverage dispensing valve configured to open and close the beverage dispensing channel is installed in the beverage dispensing channel, and the sub channel is connected to the beverage dispensing channel between the beverage dispensing valve and the second main channel or between the beverage dispensing valve and the dispenser; the beverage maker further comprising: a drain channel connected to the beverage dispensing channel at a portion between the dispenser and the beverage dispensing valve among to communicate with the outside; and a drain valve installed in the drain channel and configured to open and close the drain channel. a drain channel connected to the beverage dispensing channel at a portion between the dispenser and the beverage dispensing valve among to communicate with the outside; and a drain valve installed in the drain channel and configured to open and close the drain channel.