PURPOSE: A device for improving performance of a water treatment system using ultraviolet rays and ozone and a method thereof are provided to improve water efficiency of water heavy water, and rain water, etc, and to improve sterilization and purification efficiency. CONSTITUTION: A device for improving performance of a water treatment system using ultraviolet rays and ozone includes a reservoir(1), an AOP chamber(7), a circulation pipe(5), a circulation pump(5a), an ozone mixer(11), and a cooler(15). The reservoir stores raw water such as heavy water, rainwater etc. The reservoir is divided into a first reservoir(1a) and a second reservoir(1b). The AOP chamber sterilizes and purifies the raw water supplied from the reservoir. The ozone mixer is connected to the circulation pipe. The ozone mixer dissolves the ozone in the raw water. The cooler is connected to the circulation pipe.
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