The present invention relates to an oxygen supply apparatus for supplying dissolved oxygen to a fish tank of a fish farm, and more particularly, to a system for generating dissolved water during a process of passing bubbles and water through a dissolved water generating unit during a process of supplying bubbles and water to a pressure tank, And the dissolved water is discharged to the fish farm through the discharge pipe naturally as the air pressure of the pressure tank is increased. In order to solve the above problems, the oxygen supply device for fish farms of the present invention includes a pressure tank to which dissolved water and oxygen are supplied； A water supply pipe for supplying water to the inside of the pressure tank, one side being connected to the amphibious pump and the other side being disposed on the upper side of the pressure tank； An oxygen supply pipe having one side connected to the oxygen generator and the other side connected to the water supply pipe and supplying oxygen from one side to the other side； A dissolved water generating part formed at a connection part between the water supply pipe and the oxygen supply pipe, for supplying oxygen to the water flowing through the water supply pipe and generating dissolved water； A spray nozzle provided on the other side of the water supply pipe and spraying the dissolved water and oxygen from the upper portion to the lower portion of the pressure tank； And a drain pipe provided at one side of the pressure tank and connected to the interior of the fish farm. When the pressure of the air inside the pressure tank reaches a predetermined value, the dissolved water is supplied to the fish tank while the dissolved water flows into the drain pipe. .본 고안은 양어장의 수조에 용존산소를 공급하기 위한 산소 공급장치에 관한 것으로서, 더욱 상세하게는 기포와 물이 압력탱크로 공급되는 과정 중 용존수 생성부를 통과하는 과정에서 용존수가 생성되도록 하며, 공급된 용존수가 상기 압력탱크의 공기압의 증가에 따라 자연적으로 배출관을 통해 양어장으로 배출되도록 하는 양어장용 산소 공급장치에 관한 것이다. 상기 과제를 해결하기 위한 본 고안의 양어장용 산소 공급장치는 용존수 및 산소가 공급되는 압력탱크； 일측이 양
