The invention provides a box net device, which is suitable for a fish cage with one pool of water. The box net device includes a box plate, a box net, a barrier plate and a buoyancy element.The cage net is arranged at the bottom of the cage plate to form a holding space with the cage plate for aquaculture of aquatic animals.The barrier plate can be set on the box net to prevent the pool water from flowing into the holding space from the box net.The buoyancy element is arranged on the box plate to receive the buoyancy effect of the pool water, so that the pool water level is not higher than the top height of the box net device.When the water level of the pool rises above the top of the fish cage, aquatic animals cannot escape from the cage net device.本創作係提供一種箱網裝置，其適用於具有一池水之一魚塭，箱網裝置包含箱板、箱網、阻隔板以及浮力元件。箱網設於箱板底部，以與箱板形成供養殖水生動物之容置空間。阻隔板可動地套設於箱網，用以阻隔池水從箱網流入容置空間內。浮力元件設於箱板上，用以接收池水之浮力作用，使池水水位不高於箱網裝置之頂高。當池水之水位上升至高於魚塭之頂高時，水生動物無法從箱網裝置逃脫。
