The invention discloses a connecting device for an overwater aircraft, an entertainment overwater aircraft and a method. A hose is included. According to the entertainment overwater aircraft with highsafety, through mutual cooperation of a connecting pipe, internal threads, external threads, a first through hole, a second through hole, a fixing sleeve, a first sealing gasket, a second sealing gasket and a limiting block, awater inlet pipe pushes a first sealing gasket to be tightly attached to a second sealing gasket; through mutual cooperation of a waterproof pad, a fixing block, a telescopic device, a first sliding block, a stop block, a connecting rod, a clamping block and a clamping groove, the first sliding block slides in a first sliding groove and pulls a telescopic device to extend, the bottom end of the connecting rod rotates to the position below the waterproof pad, the waterproof pad and the bottom end of the connecting pipe are fully closed, and protection of the waterproof pad on the connecting pipe is facilitated; by the adoption of the structure, corrosion of the internal threads and the external threads due to the fact that water enters the connecting pipe is avoided, the safety and the sealing performance of the overwater aircraft are improved, the safety of the overwater aircraft is improved, and the situation that the overwater aircraft cannot take off due to poor sealing performance is avoided.