A combined thermal power generation system is disclosed. In the combined cycle power generation system according to the present invention, a part of the gas generated by the gasification unit as the fuel of the burner of the waste heat recovery boiler and purified by the purification apparatus and then supplied to the combustor may be used. Then, since there is no need for a separate fuel supply device for supplying fuel to the burner of the waste heat recovery boiler, the cost may be reduced and the volume may be reduced. In addition, since the oxygen generated in the air separator is used as an oxidizing agent of the burner of the waste heat recovery boiler, there is no need for a separate fuel supply device for supplying air to the burner of the waste heat recovery boiler. Therefore, there may be an effect of further reducing the cost and an effect of reducing the volume.
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