The invention discloses a water inflatable escape ball, which comprises an outer sphere and an inner sphere, An inn sphere comprises a helium gas bag and a gas conversion bag, A gas exchange capsule is used for generating oxygen in the inner sphere to absorb carbon dioxide, A gas concentration measuring instrument and a gas controller are arranged in the gas conversion capsule to monitor oxygen and carbon dioxide concentrations in real time and process and warn the concentration data of oxygen and carbon dioxide; the escape ball comprises a controller, a pneumatic control valve, a water pressure control valve, a pneumatic sensor, a water pressure sensor, a first exhaust port, a drain port and a pressure display, wherein the pressure display is respectively connected with the pneumatic sensor and the water pressure sensor and displays the pneumatic pressure in the helium gas bag and the water pressure in the outer sphere in real time; The controller controls the air pressure control valve and the water pressure control valve respectively according to the air pressure signal in the helium gas bag and the water pressure signal in the outer sphere detected by the air pressure sensor and the water pressure sensor, and further controls the opening and closing of the first exhaust port and the drain port.