A beverage maker comprising: a fermentation tank module having an opening ; a fermentation lid configured to open/close the opening ; and a beverage making pack , wherein the beverage making pack comprising: - a flexible container having a beverage making space (S2), wherein the beverage making pack is configured to be inserted into the fermentation tank module through the opening , such that the flexible container is accommodated inside the fermentation tank module , - a pack body to which the flexible container is coupled and which has a pack opening (S4) communicating with the beverage making space (S2) and a seating part seated on the fermentation tank module , and - a tube connected to a lower portion of the pack body and accommodated in the flexible container ; characterized in that the fermentation tank module includes a fermentation case , a fermentation tank accommodated in the fermentation case and having an inner space (S1) formed therein to communicate with the opening , and an insulation part located between the fermentation case and the fermentation tank to surround the fermentation tank ; the fermentation case includes a case body and a bracket which is arranged in the case body and to which the fermentation tank is fastened; a seat part on which the beverage making pack is seated is formed in the bracket of the fermentation case and protrudes to the opening ; and wherein the fermentation tank module includes a pack body sealing member mounted on the seat part , and the seating part of the pack body is configured to be seated in contact with the pack body sealing member , the pack body sealing member configured to seal a gap between the fermentation tank module and the beverage making pack ; and wherein the pack body is configured to be pressed downward by a pack body pressing part formed in the fermentation lid . a fermentation tank module having an opening ; a fermentation lid configured to open/close the opening ; and a beverage making pack , - a flexible container having a beverage making space (S2), wherein the beverage making pack is configured to be inserted into the fermentation tank module through the opening , such that the flexible container is accommodated inside the fermentation tank module , - a pack body to which the flexible container is coupled and which has a pack opening (S4) communicating with the beverage making space (S2) and a seating part seated on the fermentation tank module , and - a tube connected to a lower portion of the pack body and accommodated in the flexible container ; the fermentation tank module includes a fermentation case , a fermentation tank accommodated in the fermentation case and having an inner space (S1) formed therein to communicate with the opening , and an insulation part located between the fermentation case and the fermentation tank to surround the fermentation tank ; the fermentation case includes a case body and a bracket which is arranged in the case body and to which the fermentation tank is fastened; a seat part on which the beverage making pack is seated is formed in the bracket of the fermentation case and protrudes to the opening ; and wherein the fermentation tank module includes a pack body sealing member mounted on the seat part , and the seating part of the pack body is configured to be seated in contact with the pack body sealing member , the pack body sealing member configured to seal a gap between the fermentation tank module and the beverage making pack ; and wherein the pack body is configured to be pressed downward by a pack body pressing part formed in the fermentation lid . <EOS>