The desuperheater according to an embodiment of the present invention comprises: a desuperheating tube wherein overheated steam moves and the steam and sprayed water are mixed inside; and a spray tube vertically inserted from the top to the bottom of one side of the desuperheating tube to allow an inflow of water into the tube. The desuperheating tube comprises: a venturi unit for increasing the steam speed in front of the spray tube. The spray tube comprises: a spray means on the part inserted into the desuperheating tube for spraying water into the desuperheating tube. The spray means comprises: at least one porous orifice having a number of spray holes.
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