Beer manufacturing device and method for manufacturing beer by using same

A beer manufacturing method comprising:

• a flow path sterilization and washing operation of sterilizing and washing a flow path unit configured to sterilize and wash a flow path unit configured to connect the wort line of a coupler fixedly installed in a chamber to the air line of the coupler;
• a keg mounting operation of connecting an internal part of the keg containing wort therein to the sterilized and washed flow path unit by coupling a keg cap of the keg containing the wort therein to the coupler;
• an yeast supplying operation of supplying yeast for fermenting the wort contained in the keg mounted in the chamber;
• a primary fermentation operation of discharging gas generated while the wort contained in the keg is fermented to the outside by opening a gas exhaust installed in the flow path unit;
• and
• a secondary fermentation operation of naturally carbonizing the primarily fermented wort using gas generated while the wort contained in the keg is fermented by closing the gas exhaust.