Cylinder high pressure water mist system is a kind of using high pressure nitrogen stored in a high pressure gas cylinder as the power to press out the water stored in the atmospheric pressure cylinder, and mix a part of the gas into the water flow, and transport it to the nozzle through the pipeline, and forms water mist is ejected from the nozzle at high speed. Cylinder high pressure water mist system is simple in structure, can produce relatively fine mist droplets, does not require large-capacity electric drive, and is perfectly suitable for fire protection in steam turbine cabins, automobile test rooms, industrial fryers and other places.