The invention relates to a dead steam liquidation treatment system. The dead steam liquidation treatment system comprises a heat exchanger, a gas-liquid separator, a first cooling mechanism, a hot water collecting mechanism and a gas collecting mechanism. A first medium inlet of the heat exchanger is used for being connected with a dead steam exhaust pipe of a steam exhaust and dividing cylinder through a first pipeline. A first medium outlet of the heat exchanger is connected with a first inlet of the gas-liquid separator through a second pipeline. A second medium inlet of the heat exchangeris connected with an outlet of the first cooling mechanism through a third pipeline. A second medium outlet of the heat exchanger is connected with an inlet of the first cooling mechanism through a fourth pipeline. A liquid outlet in the bottom of a dead steam separator is connected with the hot water collecting mechanism through a first water pipe. The gas collecting mechanism is provided with afirst gas inlet and a first exhaust port. An exhaust port in the top of the dead steam separator is connected with the first gas inlet through a first gas pipe. According to the dead steam liquidationtreatment system, energy stored in dead steam can be utilized, and noise generated in the dead steam exhaust process can be reduced.