The invention discloses a method for producing edible salt from sea water through an industrial process and a processing device of the edible salt. The method for producing edible salt from sea water through the industrial process comprises the following steps: extracting seawater, preprocessing, concentrating, preheating, concentrating and crystallizing. The processing device of the edible salt comprises a preprocessing unit, a reverse osmosis unit, a pre-heater, a mechanical steam recompression evaporation device and a post-processing unit. Compared with the salt pan method, the method has the advantages that the large quantity of soil is saved; meanwhile, the influence of season is avoided, the investment is low and the labor is saved. By taking annual output of 50000 tons of edible salt as an example, an area of nearly 2500 acres is occupied in the salt pan method, but an area of only 50 acres is occupied in the method; the number of the required persons in the method is only 1/10 that of the required persons in the salt pan method; the basic investment for producing every ton of salt through the method is only 1/5 that of the salt pan method; the purity and the concentration of brine of the method are higher than those of the salt pan method; important chemical raw materials such as calcium sulfate, magnesium sulfate, potassium chloride, calcium chloride and bromine water can be extracted from the crystallized bittern; the energy needed for operation of the device is clean energy which is electric energy; the device is high in degree of automation, capable of continuously producing the salt in 24 hours, free of steam and really emission-free and pollution-free.