The present invention relates to a carbonated water purifier and a method for controlling the same. The carbonated water purifier includes: a carbonic acid gas cylinder which stores carbonic acid gas and supplies the carbonic acid gas to a carbonated water tank a cold water tank which stores cold water and has a water level sensor installed therein the carbonated water tank which receives the carbonic acid gas from the carbonic acid gas cylinder, receives cold water from the cold water tank, and generates and stores carbonated water a mixing pipeline in which the cold water and the carbonated water are mixed a carbonated water coke which has one side, connected to the carbonated water tank, and the other side, connected to the mixing pipeline a mixing pipeline unit having a cold water coke, which has one side, connected to the cold water tank, and the other side, connected to the mixing pipeline and a control unit which receives user&primes input of the concentration of the carbonated water to be discharged and a discharge amount of the carbonated water and controls a degree and time of opening the cold water coke and the carbonated water coke. Carbonated water with the concentration that a user desires can be provided, without using an additional pump, by controlling the concentration in the mixing pipeline while the pressure and the concentration in the carbonated water tank are maintained to be constant. When the concentration of the carbonated water is controlled by selection of the user, the user does not need to wait and can immediately use the carbonated water. Therefore, the user can conveniently use the carbonated water purifier.COPYRIGHT KIPO 2016본 발명은 탄산수 정수기 및 그 제어방법에 관한 것으로서, 탄산가스가 저장되며 상기 탄산가스를 탄산수탱크에 공급하는 탄산가스 실린더와, 냉수가 저장되며 내부에 수위센서가 설치되는 냉수탱크와, 상기 탄산가스 실린더로부터 탄산가스를 공급받고 상기 냉수탱크로부터 냉수를 공급받아 탄산수를 생성하고 저장하는 탄산수탱크와, 냉수와 탄산수가 혼합되는 혼합관로와, 일측이 상기 탄산수탱크에 연결되고 타측이 혼합관로에 연결되는 탄산수코크와, 일측이 상기 냉수탱크에 연결되고 타측이 혼합관로에 연결되는 냉수코크를 가지는 혼합관로유니트와, 사용자의 입력에 의해 출수될 탄산수의 농
