An inflatable lifesaving device is designed to provide a user with an apparatus to escape a high rise building in emergency situations in a sufficiently rapid manner. It is simply composed of a hemisphere including a plurality of independent cell airbags, internal hoses, and check valves, a parachute integrated with the hemisphere, an air supply system, an external hose, a quick release hose coupler, a harness mounted on the body of the user, a connection rope that connects the harness to the inside of the building, a rope quick release to separate the connection rope, a descent rope, a backpack. To operate the inflatable lifesaving device, the user wearing the harness with the backpack exits a window or a balcony with the harness connected to the inside of the building through the connection rope with the release device. The air supply system is then turned on and high pressure air inflates and opens up the hemisphere and the parachute so that they are gradually formed from the back of the user to the front, and eventually the user is surrounded by them. after that, the external hose and the connection rope are released. As a result, the user will move down with the hemisphere and the parachute.