The invention provides a vacuum seawater desalination and refrigeration (ice-making) integrated technology and device. The device comprises a fresh water storage cabinet, a cooling water coil, a fresh water condenser, a vacuum pump, a heat exchanger outlet temperature sensor, a vacuum pressure sensor, a vacuum tank, a client heat exchanger, a refrigerant heat exchanger, a secondary refrigerant circulating pump, a heat exchanger inlet temperature sensor, an electrical three-way valve, a secondary refrigerant flowmeter, a salinity meter, a brine cabinet, a refrigerant circulating pump, a high-low-water-level sensor, a seawater supplementing cabinet, an electric stop valve, a water mist spray pipe and the like which are connected through a pipeline or a circuit. Based on the triple point principle of water, air pressure in the vacuum tank is reduced to the saturation pressure under corresponding temperature of seawater, so that the seawater is evaporated continuously and cooled, chilled water and even ice crystals are provided for a refrigeration system, meanwhile, water vapor becomes fresh water after condensation, and seawater desalination is realized. Both refrigeration and desalination are realized by one device, and the device is applicable to a freezing and refrigerating process as well as cold supply and fresh water generation for ships or buildings.