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The present invention relates to a device for preventing a leakage of water without suspension of water supply and, more specifically, relates to a device for preventing a leakage of water, which is coupled to an outer circumferential surface of a water supply pipe to prevent a leakage of the water supply pipe, and comprises : a body assembled in and coupled to an outer circumferential surface of the water supply pipe; a first packing member formed to be ring-shaped; a finishing member assembled in and coupled to an outer circumferential surface of the water supply pipe; and a coupling member enabling the body and the finishing member to be integrated. The present invention provides the device for preventing a leakage of water without suspension of water supply, which can minimize inconvenience of local residents and cut down a replacement cost for a water supply pipe by repairing the water supply pipe without suspension of water supply in case of a leakage of the water supply pipe.