The utility model provides a high pressure water descaling device, including the descaling box body, this internal collector of descaling that is provided with two kind at least pressure of descaling box is organized, and the collector group of descaling of every kind of pressure is one row or multirow, descaling box body entry is provided with water seal device. The utility model discloses, when producing ordinary product rolled piece and descaling, only need the relatively low high -pressure water descaling collector group work of pressure, when producing some special requirement product, only need pressure high -pressure water descaling collector group work higher relatively, also can be according to the production needs, multiple pressure descale the simultaneous working of collector group to satisfy the high -efficient reasonable mass effect of descaling of market required product.