Abstract: The invention discloses a deep sea fishing cage comprising supporting frameworks and cage nets arranged therebetween; said supporting framework comprises a float supporting component and cage frameworks symmetrically arranged on two sides of float supporting component; said cage frameworks are connected with float supporting component via cage nets; the float supporting component comprises a float support rod and a support frame counterweight steel bar; said float support rod is arranged above support frame counterweight steel bar and funnel-shaped escape-proof plate is arranged on lower side of float support rod; said cage framework comprises a supporting component and a cage sealing component, wherein said supporting component is connected with cage sealing component via net surface, said supporting component comprises an upper supporting frame and a lower supporting frame, and two ends of said upper supporting frame are connected with two ends of lower supporting frame respectively to form a semicircular s