NOVELTY - Fuel ethanol is produced by adding 1 L water to 30 g corn flour, heating to 90 plus minus 2 degrees C, adding alpha -amylase, liquefying for 35 minutes, cooling to 55 plus minus 2 degrees C, adding glucoamylase, saccharifying for 50 minutes to obtain corn slurry, adding 20 g glucose, 30 ml corn slurry, 0.5 g ammonium sulfate, 0.02 g potassium dihydrogen phosphate, and 0.003 g ferrous sulfate to 1000 ml water, high-pressure sterilizing, cooling to obtain immobilized yeast cell activation and proliferation culture medium, and placing active dry yeast in 30 degrees C sterile water.    USE - Production of fuel ethanol (claimed).    ADVANTAGE - Production of fuel ethanol improves fermentation efficiency and yeast stability time, and yeast can be reused.    DETAILED DESCRIPTION - Fuel ethanol is produced by adding 1 L water to 30 g corn flour, heating to 90 plus minus 2 degrees C, adding alpha -amylase, liquefying for 35 minutes, cooling to 55 plus minus 2 degrees C, adding glucoamylase, saccharifying for 50 minutes to obtain corn slurry, adding 20 g glucose, 30 ml corn slurry, 0.5 g ammonium sulfate, 0.02 g potassium dihydrogen phosphate, and 0.003 g ferrous sulfate to 1000 ml water, high-pressure sterilizing, cooling to obtain immobilized yeast cell activation and proliferation culture medium, placing active dry yeast in 30 degrees C sterile water, mixing with 6% polyvinyl alcohol aqueous solution containing 0.6% sodium alginate, adding 5% boric acid solution containing 1% calcium chloride dropwise using syringe to obtain immobilized gel particles with diameter of 3 mm, curing for 50 minutes, filtering out immobilized gel particles, washing with saline thrice, immersing in sterile water, immersing in sterile water 5 times, adding an equal volume of culture medium, and performing aerated shaking culturing at 30 degrees C and 120 rpm for 13 hours to start proliferation, completing proliferation after 24 hours when amount of free yeast is 3.7x 107 cells/ml, continuously sending prepared fermentation culture medium to immobilized bioreactor using constant speed peristaltic pump, and performing continuous ethanol fermentation at 30 degrees C with mash flow rate of 15-16 ml/hour, residence time of 3-4 hours, and dilution rate of 0.15-0.16 per hour.