The present invention relates to a carbon-dioxide fixing device and a method for measuring the carbon dioxide-fixing efficiency of same, the method enabling the carbon dioxide-fixing amount and the running efficiency of the carbon dioxide-fixing device to be measured, in real-time, in a more simple and effective manner by comparing the supply amount of carbon dioxide (CO2) dissolved in water by means of a carbonated water maker and then supplied, and the consumed carbon dioxide-fixing amount, by means of the amount of discharged oxygen (O2) exhausted from an exhaust pipe which is installed so as to cover the upper side of a collected-water tank.
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