NOVELTY - A high salt amino acid wastewater fermenting process is performed by preparing different high-salt-content amino acid liquid sewage culture medium, adding agar solid culture medium, feeding normally activated Bacillus subtilis, inoculating to solid culture medium, gradually improving salt ability of strain, continuously culturing, inoculating domesticated B. subtilis strain in fermentation culture medium with high-salt containing amino acid wastewater as nitrogen source, ventilating with air, fermenting, centrifuging, collecting cell, and oven-drying.    USE - High salt amino acid wastewater fermenting process for producing Bacillus subtilis (claimed).    ADVANTAGE - The process directly combines wastewater treatment and fermentation, avoids pretreatment process, has low cost, changes waste to valuable product, and reduces emissions.    DETAILED DESCRIPTION - A high salt amino acid wastewater fermenting process is performed by preparing different high-salt-content amino acid liquid sewage culture medium, adding 1.5-2.5% (mass-to-volume) agar solid culture medium, feeding normally activated B. subtilis, inoculating to solid culture medium with different gradient concentration at 15-35 degrees C, gradually improving salt ability of strain, continuously culturing for 2 months in which culture mass strain contains high salt-containing amino acid which is 28-38% of wastewater in growth culture medium, inoculating 0.5-5% domesticated B. subtilis strain in fermentation culture medium with high-salt containing amino acid wastewater as nitrogen source at 15-35 degrees C culturing temperature and 100-300 rpm rotating speed, ventilating with air at 0.2-0.8 air coefficient, fermenting for 2 days, centrifuging at 4000 rpm for 10 minutes, collecting cell, and oven-drying to constant weight at 70 degrees C in which high salt-containing amino acid wastewater is wastewater from acid hydrolysis production of amino acid containing 75-150 g/L total nitrogen, 150-300 g/L amino acid, and 80-180 g/L chlorine ion, feed is B. subtilis microbial strain with preservation number CICC 20037, high-salt-containing amino acid wastewater concentrations are 125 g/L, 250 g/L, and 330 g/L, culture medium with 7-8 pH contains 30-90 g/L carbon source, 3-15 g/L monopotassium phosphate, 0-10 g/L yeast powder, 0.3-9 g/L magnesium sulfate, 0-2 g/L calcium carbonate, and 0-4 g/L ferrous sulfate, fermentation culture medium with 6-8 pH contains 125-330 g/L high-salt-containing amino acid wastewater, 30-90 g/L carbon source, 3-15 g/L monopotassium phosphate, 0-10 g/L yeast powder, 0.3-9 g/L magnesium sulfate, 0-2 g/L calcium carbonate, and 0-4 g/L ferrous sulfate, and carbon source of culture medium and fermentation culture medium is multiple glucose sugar from sucrose, molasses, cornstarch enzymolysis liquid, sweet potato starch enzymolysis liquid, and/or cassava starch enzymolysis liquid.