The present invention relates to a submersible and mobile fish cage for open-sea cultivation with improved balance and workability that is enabled to be moved safely and easily to an area of the sea requiring the fish cage by installing a conical water flow dispersion plate at the fore-end part or rear end part of a fish cage frame manufactured as a frame structure in the shape of a submarine and installing a balance tank and a submersible tank vertically at both right and left sides of the fish cage frame. More particularly, an auxiliary buoyance tank is additionally installed at both right and left middle sides of the fish cage frame corresponding to positions between the balance tank and the submersible tank to enable the fish cage to submerge and float more stably in more balance. The operations of drying a fish cage net and removing an attachment are enabled to be performed rapidly and easily on the sea by ensuring the floating height of the fish cage above the surface sufficiently to facilitate shipping operation or the like and inclining the fish cage to right and left sides while preventing the capsizal of the fish cage to expose the fish cage net except for a bottom net above the surface. The mobility and workability of the fish cage can be improved by reduction in the weight of the fish cage and the fish cage frame including a water flow dispersion membrane can be maintained efficiently as the water flow dispersion plate is installed as the water flow dispersion membrane composed of waterproof cloth and each frame constituting the fish cage frame is composed of a hollow pipe and is connected in assembly.본 발명은 잠수함 형태의 골조구조물로 제작된 가두리프레임의 선단부 또는 후단부에 고깔 형상의 수류분산판을 설치하고, 가두리프레임의 좌,우 양측에는 밸런스탱크와 침하부상탱크를 상,하로 각각 설치함으로서, 가두리장치를 요구하는 수역으로 안전하고 용이하게 이동시킬 수 있도록 한 이동형 침하부상식 외해양식 가두리장치에 관한 것으로서, 더욱 상세하게는 상기 밸런스탱크와 침하부상탱크의 사이에 해당하는 가두리프레임의 좌,우 중앙측에 보조부력탱크를 추가로 설치하여 가두리장치의 침하 및 부상작업을 보다 더 균형적이고 안정적으로 수행토록 하며, 가두리장치가 수면위로 부상되는 높이를 충분히 확보하여 출하작업 등의 편의성을 도모함은 물론, 가두리장치의 전도
