The utility model provides a power station steam turbine high pressure fire resistant oil moisture suppression device, includes the respirator that the top set up, still including the air inlet who sets up at respirator relative position, air inlet is the air dryer of UNICOM, air cleaner, manometer, valve in proper order. The respirator adopts one way check valve to set up, and the air only can goout. Use this device, is showing the effect below having: 1, prevent that external pollutant from getting into the EH oil tank. 2, not only get rid of the moisture in the EH oil tank top layer space,can constantly sweep through what dry gas personally experienced sth. Part of the body moreover, get rid of and get into EH oil interior free water, emulsified water, dissolve water. 3, it forms sourly and the pollutant to prevent that the phosphate ester from hydrolysising. 4, the dry gas that incessantly the sweeps body be enough to maintain breathe mouthful in drying medium's activity to it breathes intraoral drier to need not frequently to change.