NOVELTY - Preparing fermented zinc-containing feed additive, comprises (i) mixing solid materials and liquid materials, fermenting, drying, and packaging, and directly collecting the liquid material directly from plate and frame filter frame alcohol of industrial yellow water, filtering, and sterilizing by adjusting the pH to 6.8-7.2; and (ii) carrying out zinc absorption ability of microorganisms by screening and domesticated culturing processes by preparing zinc-containing basal medium and zinc-containing gradient medium, and inoculating microorganism to zinc-containing basal medium, and culturing.    USE - The method is useful for preparing fermented zinc-containing feed additive (claimed).    ADVANTAGE - The method is environmental friendly, and economical.    DETAILED DESCRIPTION - Preparing fermented zinc-containing feed additive, comprises (i) mixing solid materials and liquid materials in a ratio of 1:1, to obtain fermentable substrate, inoculating microorganism into fermentable substrate, fermenting, drying the materials, and packaging the prepared products, and directly collecting the liquid material directly from the plate and frame filter frame alcohol of industrial yellow water, filtering, and sterilizing by adjusting the pH to 6.8-7.2, where the solid material used is 8.62 wt.% zinc raw material, 24.4 wt.% powder residue, 48.2 wt.% wheat bran, 18.4 wt.% corn flour, 0.15 wt.% urea, 0.18 wt.% sugar and 0.05 wt.% sodium bicarbonate, and the zinc raw material used is inorganic zinc; and (ii) carrying out zinc absorption ability of microorganisms by screening and domesticated culturing processes by (a) preparing zinc-containing basal medium by dissolving 5 g beef extract, 10 g peptone, 5 g sodium chloride and 100 mg zinc in distilled water, diluting to 1 l product, then adjusting the pH to 6.8-7.2, and then preparing zinc-containing gradient medium by adding 10% zinc-containing basal medium, and sequentially disposing into the zinc-containing gradient medium, (b) taking 5-8% microbial inoculum, inoculating the microorganism into the step (a) zinc-containing basal medium at 37.2-37.6 degrees C, and culturing at 55 rotations/minute in an incubator for 24 hours, recording the number of various microorganisms, and screening large number of bacterial cells used for microbial fermentation, and (c) collecting the microorganisms cultured under the same culture conditions, successively screening the microbial strains grown in the steps (i) and (ii), measuring the zinc content of microorganisms, and obtaining the final product having high zinc content.