The existing circulating aquaculture water level regulation device has disadvantages such as inconvenient operation and inaccurate regulation of water level, which brings great inconvenience to the daily management and maintenance of circulating water system. In this paper, a device which can adjust the water level of the breeding barrel is designed for the circulating water system, so that the water level height of the circulating aquaculture barrel can be adjusted according to the density and size of the breeding object, thus the maintenance and energy consumption cost in the process of circulating aquaculture can be reduced.