Noise reduction device

The utility model relates to the technical field of water heaters, in particular to a noise reduction device and a detection method thereof. According to the noise reduction device, after water in a water pump enters the noise reduction device, the water enters the buffering inner core through the water inlet of the shell, the water is subjected to first-time speed and pressure attenuation under the obstruction of the sealing end of the buffering inner core, and then the water is subjected to second-time speed and pressure attenuation when passing through the second water outlet hole; the second water outlet hole right faces the concave part, water acts on the concave part, resistance is provided under the action of stored water between the buffering inner core and the buffering outer core, then the water flows to the concave part from the second water outlet hole, then third-time speed and pressure attenuation can be achieved, after the water is attenuated for three times, the water flow tends to be gentle,