The invention provides a high-pressure gas jet buoyancy ball device. The high-pressure gas jet buoyancy ball device comprises a cylinder body, an end cover, pressure stabilizing valves, a safety valve, an I-shaped connecting rod piston, a high-pressure gas cylinder and a buoyancy ball; the high-pressure gas jet buoyancy ball device is characterized in that when an underwater carrier is in normal operation, an unreleased state of the buoyancy ball can be maintained; when the underwater carrier floats to the water surface after the operation is completed, a control system can apply a signal to switch on the pressure stabilizing valves, and high-pressure gas is enabled to enter the cylinder body; when the pressure of gas in the cylinder body reaches a certain value, the safety valve is switched on, the cylinder body is fully filled with the gas, and a piston is enabled to move by utilizing a way that two ends of the piston are in unbalanced stress, so that the high-pressure gas in closed space is enabled to act on the buoyancy ball, the buoyancy ball is ejected to the water surface which is at a certain distance from the underwater carrier, and the underwater carrier can be successfully recycled by recycling personnel on the premise that the recycling personnel keeps a safe distance from the underwater carrier. The high-pressure gas jet buoyancy ball device provided by the invention depends on a high-pressure gas jet method and has the advantages of high reliability, strong impact, wide adjustable range and the like.