The utility model relates to a floated sea water desalination in deep sea of no breather pipe, include floated seawater desalination module, offshore platform, go up hawser, hose cable component spare, top -down is equipped with air drum, reverse osmosis formula seawater desalination subassembly, water storage tank in the seawater desalination module, the seawater desalination subassembly passes through second pipeline and air drum intercommunication through first pipeline and water storage tank intercommunication, water storage tank, seawater desalination subassembly front end is equipped with the electrical axle who carries into the sea water and flows the pump, and the hose that the water storage tank delivery port was lightered in pump and the hose cable component spare through electronic fresh water is connected with the offshore platform, the offshore platform is connected through last hawser and floating seawater desalination module. The utility model discloses the system is inside only need to establish a fresh water collecting pipe, has simplified the system, has increased the reliability, the air drum arranges on module upper portion, and the buoyant center of ensureing the module is last, and the focus is under, can ensure that the module is still marine to keep correct posture, prevents to topple, set up electrical axle and flow the pump, do not set up from the offshore platform the pump and go into the system of sea water, festival energy saving volume with simplify the structure.