This utility model discloses a top-mounted rotatable IVC device, including a base plate with several casters with brakes at its bottom, a mounting hole in the middle of the base plate, a swivel bearing seat installed in the mounting hole, a bearing connected to the swivel bearing seat, and extending upward through the cage frame base plate; several cage frames installed on the cage frame base plate, with several exhaust pipes and air nozzles on the exhaust pipes; and an electrical box installed on top of the cage frames. In this utility model, the cage frame base plate can be rotatably connected to the base plate, and the base plate abuts against the cage frame base plate via ball bearings on a support member, enabling the entire cage frame to rotate while being supported at the bottom. This improves the stability of the entire rotating structure, allowing it to rotate freely 360 degrees, facilitating operators to easily access the required cages and improving work efficiency. Simultaneously, the rotating design allows the cage frame to accommodate more cages within a limited space, increasing
stocking density.