The present invention relates to a composition for making carbonated water which, if put into water, generates carbon dioxide to make the carbonated water, and to a making method thereof, which enhance a carbonation effect and prevent internal liquefaction reaction when seal-packed and a swelling phenomenon of a packing material therefrom. The present invention comprises the following steps: preparing a mixture by mixing 120-180 parts by weight of sodium hydrogen carbonate and 1-10 parts by weight of additives containing vitamins (A, B, C, D, E), menthol powder, natural betain, and allantoin powder, with respect to 100 parts by weight of citric acid； drying the mixture for 3-15 hours under temperature of 60°；C or less and humidity of 50% or less to liquefy a portion of the menthol powder and make the moisture, generated due to the liquefaction, react with a portion of sodium hydrogen carbonate to discharge carbon dioxide； pulverizing the mixture from which the moisture of the menthol powder is removed under the dehumidified condition that the humidity is 50% or less； and packing the pulverized mixture with a sealing material under the dehumidified condition that the humidity is 50% or less.본 발명은 물에 넣으면 탄산가스를 발생시켜 물을 탄산수로 만드는 탄산수 제조용 조성물 및 그 제조방법에 관한 것으로, 탄산수 효과를 높이고, 밀봉 포장시 내부의 액상화 반응 및 이로 인한 포장재의 부풀어 오름 현상을 방지하는 효과를 제공할 수 있다.
