The utility model provides a water system on thermal power factory oxygen -eliminating device, including two condensate pump of sharing converter, two condensate pump sharing condensate lines communicate to the oxygen -eliminating device, the condensate line on parallelly connected set up flow pneumatic door and bypass door, bypass door, converter and two condensate pump's control end is connected to condensate pump bypass gate control station respectively. The utility model discloses a reducing condensate water system resistance, reducing the condensate pump power consumption, be connected to condensate pump bypass gate control station respectively with bypass door, converter and two condensate pump's control end, can move the in -process like this, converter and two condensate pump's running state can be monitored in condensate pump bypass gate control station to open / close according to this state control bypass door. Especially, at the normal operating in -process, change the bypass door into the standard -sized sheet method of operation by the original complete shut -down method of operation to this increases flow area, reaches the energy saving and consumption reduction purpose.