Provided is a power plant having a pure oxygen combustor. The power plant includes a heat supplying unit supplying a heated steam; a turbine unit generating mechanical energy by rotating a turbine using the heated steam supplied by the heat supplying unit; a power generator converting mechanical energy generated by the turbine unit into electrical energy; a steam condenser condensing steam passing through the turbine unit; and a first combustor disposed at one side of the turbine unit and reheating the steam supplied to the turbine unit by using pure oxygen combustion.