NOVELTY - Island diesel power plant waste hot water producing device comprises e.g. organic rankine cycle (ORC) power generation system matched with a sea water desalination system. The ORC power generation system comprises a working medium evaporator (21), a turbine expansion machine (23), a generator (5), a working medium condenser (4) and a working medium booster pump (6). The sea water desalination system comprises a steam generator, a water purifier, a sea water storage tank, sea water pump, brine storage tank, fresh water storage tank and an internal combustion engine cooling water heat exchanger.    USE - Used as island diesel power plant waste hot water producing device (claimed).    ADVANTAGE - The method: utilizes a condenser working medium, which enables condensation process in the working medium and allows the heat to enter into desalting process, thus improving sea water desalting efficiency; utilizes ORC power generation system, which uses large amount of sea water as a refrigerant; recovers cooling water; improves steam yield in the internal combustion machine; and does not require external power supply or steam energy, thus improving the fresh water yield to 500t/d, and the power generation of 2000 KWh/d.    DETAILED DESCRIPTION - Island diesel power plant waste hot water producing device comprises organic rankine cycle (ORC) power generation system matched with a sea water desalination system. The ORC power generation system comprises a working medium evaporator (21), a turbine expansion machine (23), a generator (5), a working medium condenser (4) and a working medium booster pump (6). The sea water desalination system comprises a steam generator, a water purifier, a sea water storage tank, a sea water pump, a brine storage tank, a fresh water storage tank, an internal combustion engine cooling water heat exchanger, a hot water pump, a hot water storage tank and a sea water desalting device. An exhaust passage is installed in a combined waste heat boiler comprising a working medium evaporator and steam generator. The working medium evaporator is connected with the turbine expansion machine. The working medium condenser is connected with a working medium booster pump. The turbine expansion machine is coaxially connected to the generator. The water through a seawater inlet enters into a seawater purifier, which is sequentially connected to a water tank, sea water pump, working medium condenser, a hot water storage tank, hot water pump and sea water desalting device. The sea water desalting device is respectively connected to the concentrated salt water storage tank and a fresh water storage tank. The fresh water storage tank is sequentially connected to the water pump, internal combustion engine cooling water heat exchanger, a throttle valve and steam generator. The hot water storage tank is connected with the water storage tank through a check valve. The internal combustion engine cooling water heat exchanger is set a cooling water inlet and a cooling water outlet. An INDEPENDENT CLAIM is also included for producing island diesel power plant waste hot water, comprising (a) utilizing ORC power generation system matched with the sea water desalination system, where the working medium condenser of the ORC power generation system, which enables condensation process in the working medium and allows the heat to enter into desalting process to improve sea water desalting efficiency, where the ORC generating system uses sea water desalting system, which provide large amount of sea water as a refrigerant, controlling the working medium condenser temperature, and co-generating water, (b) setting an exhaust passage in the waste heat boiler of the machine, where the combined waste heat boiler is divided into two sections including a high temperature section and a low temperature section, where the high temperature section uses evaporative seawater desalination and the low temperature section uses steam generator, (c) setting an exhaust passage in the waste heat boiler of the machine, where the combined waste heat boiler is divided into two sections including a high temperature section and a low temperature section, where the high temperature section uses reverse osmosis membrane type sea water desalting, and the low temperature section uses evaporator, and (d) allowing the fresh water from the evaporator to enter into internal combustion engine cooling water heat exchanger, recycling the cooling water and improving steam yield in the internal combustion machine.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of island diesel power plant waste hot water producing device.    Working medium condenser (4)    Generator (5)    Working medium booster pump (6)    Working medium evaporator, (21)    Turbine expansion machine (23)