NOVELTY - The method comprises obtaining power station warm discharge water, making sea water to pass through a condenser (1) and condensing using steam discharged from a power station steam turbine (2), where the warm discharge water uses waste heat for seawater desalination, increasing a portion of the warm discharge water temperature to 70 degrees C by an absorbing type heat pump, passing to a low pressure evaporator to generate steam, and introducing the steam into a low-temperature multiple effect seawater desalting system to generate desalting water.    USE - The method is useful for desalting seawater using power station warm discharge water for obtaining fresh water.    ADVANTAGE - The method is capable of effectively desalting seawater using power station warm discharge water with reduced energy consumption.    DETAILED DESCRIPTION - The method comprises obtaining power station warm discharge water, making sea water to pass through a condenser (1) and condensing using steam discharged from a power station steam turbine (2), where the warm discharge water uses waste heat for seawater desalination, increasing a portion of the warm discharge water temperature to 70 degrees C by an absorbing type heat pump, passing to a low pressure evaporator to generate steam, and introducing the steam into a low-temperature multiple effect seawater desalting system to generate desalting water. The part of power station warm discharge water firstly absorbs the heat raising temperature by a heat exchanger (6), and then enters into an absorption type heat pump (3). The driving heat of the absorbing type heat pump is mainly derived from the warm discharge water power station, and supplemented by low-grade steam that is extracted from the power station steam turbine. The evaporator is operated at a low pressure of 0.01-0.025 MPa.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a method for desalting seawater.    Condenser (1)    Power station steam turbine (2)    Absorption type heat pump (3)    Heat exchanger (6)    Cooling circulation pump. (7)