Double-air-bag buoyancy vest capable of providing multiple inflation modes for diving breathing apparatus

The utility model relates to a double-air-bag buoyancy vest which is used for a diving breathing apparatus and can provide multiple inflation modes, and the double-air-bag buoyancy vest comprises a vest body, an inner-layer air bag, an outer-layer air bag, two mouth-blowing inflation valves, two inflator interfaces, a hand-pulling exhaust valve, an inflation tube and an air bottle, an inner-layer air bag and an outer-layer air bag are sewn between the interlayers of the vest body, and the inner-layer air bag and the outer-layer air bag are the same in structure and each comprise a neck air bag, a chest air bag and a back waist air bag which are communicated. The buoyancy device not only can provide underwater neutral buoyancy and overwater positive buoyancy for a diver like a traditional buoyancy device, but also can be used as a buoyancy life-saving vest to provide overwater positive buoyancy for people losing perception, and the position of the buoyancy center ensures that the face of the diver faces upward