A beer-making device according to an embodiment of the present invention may comprise: a chamber; a keg containing wort and mounted in the chamber; a keg cap integrated with a yeast capsule, which closes the inside of the keg by being coupled to the keg and is provided with a wort discharge passage for discharging the wort contained in the keg, a gas discharge passage for discharging a gas inside the keg, and a wort hose coupled to a lower portion of the wort discharge passage and extended to the inner bottom surface of the keg, and in which a yeast capsule, containing yeast to be supplied to the wort contained in the keg, is mounted to the wort discharge passage; a coupler which is fixedly installed in the chamber, and is provided with a wort passage connected to the wort discharge passage when the keg cap is coupled, and a gas passage connected to the gas discharge passage when the keg cap is coupled; a passage unit for connecting the wort passage and the gas passage of the coupler; a pump connected to the passage unit; and a control unit for controlling the operation of the pump so that the yeast contained in the yeast capsule is supplied to the wort contained in the keg.