The present invention relates to a lifesaving tube used in water rescue. The lifesaving tube is used to rescue a user when drowning accidents take place. The lifesaving tube can be easily carried, is supplied with gas to be quickly inflated with the gas therein upon coming in contact with water after being thrown to the spot of the drowning accident, and floats on the surface of the water. The lifesaving tube includes a first tube (11), a second tube (12), a one-way valve (15), a coupler (17), and a gas supply device (20).;COPYRIGHT KIPO 2016
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