NOVELTY - Trans-critical air conditioner and seawater desalting cogeneration system includes evaporator (1), throttling device (2), regenerator (3), multi-effect distillation unit (4), multi-spray seawater inlet cut-off devices, multi-vacuum pump inlet closing devices, vacuum pump (7), spraying device, gas liquid separation device, fresh water condenser, two seawater inlet filters, two seawater inlet water pumps, fresh water outlet water pump, concentrated seawater outlet water pump, concentrated seawater outlet closing device and fresh water outlet closing device.    USE - Trans-critical air conditioner and seawater desalting cogeneration system.    ADVANTAGE - The device is more compact and has reduced volume.    DETAILED DESCRIPTION - Trans-critical air conditioner and seawater desalting cogeneration system comprises evaporator (1), throttling device (2), regenerator (3), multi-effect distillation unit (4), multi-spray seawater inlet cut-off devices, multi-vacuum pump inlet closing devices, vacuum pump (7), spraying device, gas liquid separation device, fresh water condenser, two seawater inlet filters, two seawater inlet water pumps, fresh water outlet water pump, concentrated seawater outlet water pump, concentrated seawater outlet closing device, fresh water outlet closing device, two heat exchangers, evaporative condenser, seawater outlet pressure reducing devices, fresh water outlet pressure reducing devices, water supply pumps, outlet, air cooler and compressor. The fresh water collecting pipe is used for collecting liquid fresh water and the concentrated waste water discharging pipe is used for collecting terminal concentrated seawater. The air cooler of refrigeration cycle unit is divided into two sections along the flow direction of the refrigerant. Each segment starts air cooler from the first-effect distillation unit to effect distillation unit as gas cooling module.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic structure diagram of trans-critical air conditioner and seawater desalting cogeneration system.    Evaporator (1)    Throttling device (2)    Regenerator (3)    Multi-effect distillation unit (4)    Vacuum pump (7)