The utility model discloses a condensate water circulation system of a power plant. The condensate water circulation system of the power plant comprises a condensate pump unit (4), a deaerator water tank (1), a low-pressure heater unit (2), a recycling branch (3), a condensate water supplement water tank (6) and a condensate water recycling branch (7). A control module is arranged on a frequency converter and the control module is used for responding a water level signal of the deaerator water tank (1) so as to adjust rotating speeds of three condensate pump, and a deoxidizing water level adjusting door and a deoxidizing water level isolating door are arranged on a bypass pipe of a low-pressure heater. The utility model further discloses another condensate water circulation system of the power plant. The condensate water circulation system of the power plant comprises a condensate pump unit, a deaerator water tank, a low-pressure heater unit, a condensate water supplement water tank and a condensate water recycling branch. A control module is arranged on a frequency converter and the control module is used for responding a water level signal of the deaerator water tank so as to adjust rotating speeds of three condensate pump, and a deoxidizing water level adjusting door and a deoxidizing water level isolating door are arranged on a bypass pipe of a low-pressure heater. The condensate water circulation system of the power plant is capable of simplifying arrangement of condensate water pipelines.