The utility model relates to a reduce boiler feed water device of oxygen -eliminating device mounting height, including removing oxygen ware, boiler feed pump, venturi, stop valve, boiler feed pump's delivery outlet is connected with venturi's entry cylindrical section, the exit linkage of pressing the pipe and removing the oxygen ware is got to the burden of venturi's drum choke section, and venturi's circular cone diffuser and stop valve are connected, and a stop valve delivery outlet branch road meets boiler feed water input tube, another branch road and boiler feed pump input port connection. The utility model discloses an advantage: the utility model discloses only need pump the mouth, increase by a bypass, install a venturi and a stop valve, can adjust the static pressure of boiler feed pump import through the stop valve aperture to make the mounting height that reduces the oxygen -eliminating device, avoid the boiler feed pump cavitation erosion to damage.