NOVELTY - Microbial inoculum comprises embedding carrier, nutritive salt solution, growth factor solution and bacteria enzyme mixed solution according to the ratio of 200-300:0-10:0-15:50-100.    USE - The microbial inoculum is useful for purifying water (claimed) i.e. sewage water.    ADVANTAGE - The microbial inoculum has high absorption ability, strong carbon activity, and can treat sewage within three weeks, high ammonia nitrogen removal rate of 85-90% and chemical oxygen demand removal rate of 90-95%.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing microbial inoculum comprising adding 55-70 g of adding sodium alginate with 1000 ml of distilled water at 60-80 degrees C and then adding polyvinyl alcohol, activated carbon, diatomaceous earth and mixed polyglutamate and cooling to room temperature to obtain an embedding carrier, adding nutrient salt solution with growth factor solution and bacteria enzyme mixed solution, stirring the mixture uniformity, dropping 2% of calcium chloride solution in the mixture and then refrigerating at 4 degrees C, continuously crosslinking for 8-12 hours to form an immobilized small ball and then adding vitamin B1, washing the obtained product using physiological saline for 2-3 times to obtain the embedded microorganism microbial inoculum, mixing Bacillus subtilis, Cellulomonas bacteria, Acinetobacter, nitrifying bacteria, Pseudomonas and Bacillus licheniformis broth according to the volume ratio of 1-10:1-8:2-15:1-5:1-6:1-7 to obtain bacterial mixture, inoculating inclined plane strain in a seed culture medium at temperature of 35-37 degrees C, rotating speed of 150-200 revolutions per minute (rpm) for 1-2 days, inoculating the seed liquid into 1-2% of fermentation culture medium at temperature of 35-37 degrees C and rotating speed of 180-220 rpm for 1-2 days to obtain fermentation liquid, mixing 30-50 mg of sample with 25% of 500 ml of ethanol solution and then adding vitamin B1, vitamin B6, vitamin K, nicotinic acid and thiamine to obtain a mixed solution, refrigerating at 4 degrees C and then adding 10 ml of distilled water into a volumetric flask to obtain growth factor solution, uniformly mixing the prepared carrier, nutritive salt solution, growth factor solution and bacteria enzyme mixed solution, where the sodium alginate, activated carbon, polyvinyl alcohol, diatomaceous earth and polyglutamic acid composition are present in the mass ratio of 55-70:2-5:0-5:1-2:1-4, the bacterial mixture and sewage fermentation liquid are present according to the ratio of 100-200 ml:1-5 g, the seed culture medium comprises 0.5% of peptone extract, 0.5% of sodium chloride and 1% of pure water having pH value of 7.2-7.4, the fermentation liquid bacterial liquid has optical density of 0.8-1, the enzyme comprises cellulose, neutral protease, low temperature amylase and lipase according to the ratio of 1-4:1-13:1-7:1-4, the nutrient salt solution is 0.4-0.6% of sodium chloride, 0.2-0.4% of ammonium sulfate, 0.1-0.2% of sodium nitrate, 0.1-0.3% of monopotassium phosphate and purified water.