The utility model provides a two-stage phase-change heat transfer device for recovering steam containing impurities. The two-stage phase-change heat transfer device comprises a steam-water mixer shell. A steam recovery pipe is arranged in the steam-water mixer shell and communicated with the outside of the steam-water mixer shell. The steam-water mixer shell is communicated with a steam-water heat exchanger through a purification pipeline. The steam-water heat exchanger is communicated with an evacuating device through a negative pressure pipe. The bottom of the steam-water heat exchanger is communicated with the steam-water mixer shell through a return pipe. A reflux pump is installed on the return pipe. A heat exchange coil is installed in the steam-water heat exchanger. Two ends of the heat exchange coil are respectively communicated with a water supply pipe and the return pipe. The two-stage phase-change heat transfer device for recovering the steam containing the impurities can collect the impurities in the steam which contains the impurities and is produced in the process of steelmaking, and recover heat and water which are contained in the steam at the same time, and therefore pollution to environment by the steelmaking steam can be reduced, consumption of heating energy resources and water resources of steelmaking enterprises can be beneficially reduced, production cost can be reduced, and energy saving and effect enhancing can be achieved.