The present invention relates to a low-energy consumption pressure spray desalination device and a method thereof, and belongs to the field of sea-water desalination. The device part mainly comprises an air compressor set, a high pressure air tank, a high pressure hot seawater tank, a desalination and separation chamber, a hot air recoverer, a seawater heat exchanger tank and a freshwater tank. The spray desalination method mainly comprises the following steps: pressing seawater in sprinklers by high pressure, carrying out salt and water separation in the desalination and separation chamber in the high pressure spray manner. According to the present invention, the heat energy recycling and utilizing is realized; the high pressure gas phase power is adopted to transfer the spray, two heat exchanger method of convection and radiation are adopted, and the condensing waste heat is adopted for seawater heat energy recycling, such that the moving parts contacting with the seawater are reduced to the minimum, the system is simple, the operation is safe and stable so as to achieve purposes of low-temperature vaporization, low energy consumption, low investment, high yield, high efficiency and long service life.