NOVELTY - A natural circulation livestock microbial inoculumis composed of a bacterial fermentation solution containing flash bacillus genus (Allochromatium), flash sac genus (Lamprocystis), halophilic red pylori genus (Halorhodospira), coloring bacterial genus (Chromatium), hair nitration bacillus genus (Nitrosomonas), nitrate bacteria genus (Nitrobacter) and mesh sulfur bacterial genus (Thiodictyon), and the fermentation liquid has effective viable count in each rhizome of 1x 108 CFU/ml.    USE - As natural circulation livestock microbial inoculum (claimed).    ADVANTAGE - The natural circulation livestock microbial Inoculum improves the livestock environment; and provides good purification effects in both livestock product and drinking water.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of natural circulation livestock microbial inoculum, involving: (i) preparing culture medium for manufacturing the culture liquid by adding in each 1 liter of water, 0.5 g potassium dihydrogen phosphate (KH2PO4), 0.2 g magnesium sulfate heptahydrate magnesium sulfate water (MgSO4.7H2O), 0.4 g sodium chloride (NaCl), 1.2 g ammonium chloride (NH4Cl), 0.05 g calcium chloride dihydrate (CaCl2.2H20), not greater than 0.3 g yeast extract (yeast extract), and 1 ml mineral liquid (where each 1 liter contains 25 vol./vol.% hydrogen chloride (HCl), 70 mg zinc chloride (ZnCl2), 100 mg manganese chloride tetrahydrate (MnCl2.4H2O), 60 mg boric acid (H3BO3), 200 mg cobalt chloride (CoCl2.6H2O), 20 mg copper chloride (CuCl2.H2O) and 40 mg sodium molybdate dihydrate (NaMoO4.2H2O)), after fully dissolving, adjusting pH value of aqueous solution 7, and performing high-pressure sterilization treatment; and (ii) taking 5 liter reference culture on the basis of culture medium, adding 7 pathogenic bacteria into a transparent glass container having 100 liter water to maintain temperature of at 36-40 degrees C, distance surface 12-18 cm and light wavelength of 4-36 W, and then culturing for 6-8 days.