The invention is a kind of water jet aerator, which includes a submerged water pump which can draw up the water in the aquaculture pond, a water spray tray which is arranged at the top drain of the submerged water pump, and a floating body which can make the submerged water pump vertically and float on the water surface of the aquaculture pond. The water spray tray is provided with a number of inclined water spray pipes which are arranged in a spiral arc shape, so as to improve the water quality of the aquaculture pond. In order to improve the efficiency of the aerator, the range of the water jet from the spray pipe should be extended to make the oxygen content of the pool water more evenly distributed.本創作係為一種噴水式增氧機，包含有一可將養殖池水往上抽吸之沉水泵浦、一設於沉水泵浦頂端排水口之噴水盤，及一得以令沉水泵浦成直立狀浮設於養殖池水面上之浮體；其中，該噴水盤設有若干傾斜狀之噴水管道，該噴水管道並呈旋弧狀而設，藉此可提高經由噴水管道噴出水柱之射程距離，擴大水花之落點範圍，使池水之含氧量更為平均分佈，以提高增氧機之使用效率。
