The present invention relates to a water bag for supplying water to a tree, and more specifically, to a water bag for supplying water to a tree, using a tubular water storage part having one opened side to be used by being easily and conveniently inserted into a tree, and using a sheet attached thereto to close or open a drain hole formed on the inner circumferential surface of the water storage part, and installed in a tree planted in a park or a highway where additional facilities are not present, so as to allow a worker to supply the water in a desired time. According to the present invention, the water bag comprises: the water storage part (100) storing water inside; a water supply part (200) formed in the upper part of the water storage part (100) to inject the water inside the water storage part (100); a drain hole (300) formed along the inner circumferential surface of the water storage part (100) by being spaced at constant intervals to drain the water stored in the water storage part (100); and the sheet (400) disposed in the drain hole (300), and attached and fixated along a circumferential direction on the inner circumferential surface of the water storage part (100) to close the drain hole (300).;COPYRIGHT KIPO 2017
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