The purpose of the present invention is to provide a kind of amphibious aircraft air cushion system, comprise body, air cushion, air passage, booster chamber are set in the body, intake fan is arranged on the body, intake fan is arranged at the entrance of air passage, air passage and pressurization The chambers communicate with each other through the air jet holes, the bottom surface of the pressurization chamber is the bottom plate, and the bottom plate is provided with exhaust holes, the air cushion includes air bags, the air bags are arranged under the bottom plate and outside the air jet holes, and the hydraulic device in the cabin is set in the pressurization chamber , the gasket is set in the airbag, the top of the shock absorber is connected with the hydraulic pressure in the cabin, the bottom of the shock absorber is connected with the air cushion through the gasket, the side of the air cushion is provided with a web, the rear of the air cushion is provided with a tail plate, and the web is connected The web hydraulics, the transom are connected to the transom hydraulics. The invention is applicable to various operating environments and complex terrains, has excellent cushioning performance, can improve water surface navigation speed, stability under high sea conditions, and safety during take-off and landing, shortens take-off and landing time, and enhances maneuverability and stealth performance.