Rapid buoyancy adjusting device with water leakage detection function

The utility model provides a quick buoyancy adjusting device with a water leakage detection function, which changes the drainage and buoyancy center of an aircraft by sucking/discharging air in an aircraft cabin into/out of an external air bag so as to assist a deepwater hydraulic buoyancy adjusting system of the aircraft to quickly realize buoyancy and posture adjustment in shallow water. And rapid emergency diving or rapid water outlet communication of the aircraft is realized. The buoyancy adjusting device comprises an air bag, a one-way valve, an air pump, an electromagnetic valve, a four-way base body and a water leakage detection assembly. A connector a of the four-way base body is connected with the air bag and is locked at the joint through a fastener; an outlet b of the four-way base body is connected with an air outlet of the air pump through a pipeline provided with a one-way valve, and the outlet end of the one-way valve is connected with the outlet b of the four-way base body. The water leakage d