Marine vest inflatable life jacket consists of a nylon cloth composite TPU air chamber, an automatic inflation device, a CO2 gas cylinder, an outer cover and a mouth-blowing air tube. In an emergency situation of falling into the water, the automatic inflation device can inflate the air chamber within 5 seconds, or the manual pull rope can be pulled to inflate the air chamber and form buoyancy to ensure the safety of the person who falls into the water. This product is small in size, light in weight, comfortable to wear and easy to use. It is suitable for life-saving of various types of water navigation ship operators, and can also be used as a personal protective equipment for leisure life-saving.