NOVELTY - Liquid corn fertilizer in optical degradation film includes bran, feet residue, coffee bean, composite microbial inoculants, modified starch solution, fish viscera powder, ferric stearate, and water. The ratio of composite microbial inoculants which comprises silicate bacteria, Bacillus subtilis and photosynthetic bacteria is 2:2:1. The modified starch solution comprises potato starch, calcium acetate, potassium permanganate solution, acrylic acid, sodium hydroxide, N,N-methylenebisacrylamide, ferrous sulfate, zinc sulfate, and manganese sulfate.    USE - Liquid corn fertilizer in optical degradation film used for increasing corn yield.    ADVANTAGE - The fertilizer has faster film degradation process and no residues which ensures safety of soil environment.    DETAILED DESCRIPTION - Liquid corn fertilizer in optical degradation film comprises 36-40 pts. wt. bran, 20-22 pts. wt. feet residue, 7- 11 pts. wt. coffee bean, 3-4 pts. wt. composite microbial inoculants, 12-18 pts. wt. modified starch solution, 18-24 pts. wt. fish viscera powder, 1-2 pts. wt. ferric stearate, and water. The ratio of composite microbial inoculants which comprises silicate bacteria, Bacillus subtilis and photosynthetic bacteria is 2:2:1. The modified starch solution comprises 45-55 pts. wt. potato starch, 2-4 pts. wt. calcium acetate, 2-3 pts. wt. potassium permanganate solution, 15-20 pts. wt. acrylic acid, 3-4 pts. wt. sodium hydroxide, 0.1-0.3 pts. wt. N,N-methylenebisacrylamide, 8-10 pts. wt. ferrous sulfate, 6-8 pts. wt. zinc sulfate, and 7-9 pts. wt. manganese sulfate. The modified starch solution is prepared by dissolving potato starch into 2 times by wt. water, heating at 70-90 degrees C, gelatinizing for 30-60 minutes, carrying out oxidation reaction by adding potassium permanganate solution, stirring for 50-70 minutes, adding acrylic acid and sodium hydroxide, carrying out crosslinking reaction by adding N,N-methylenebisacrylamide for 20-30 minutes, adding calcium acetate, uniformly stirring, heating at 50-60 degrees C, adding ferrous sulfate, chelating for 15 minutes, uniformly stirring, adding zinc sulfate, chelating for 15 minutes, adding manganese sulfate, heating at 60-80 degrees C, and chelating for 20-30 minutes. An INDEPENDENT CLAIM is included for preparation of liquid corn fertilizer in optical degradation film comprising mixing bran, feet residue, fish viscera powder and ferric stearate into fermentation tank, adding adequate water, maintaining moisture content of 45-50%, fermenting 3-4 weeks, taking out fermented material, pressing to obtain liquid fermentation; drying coffee beans at 65-75 degrees C, crushing into fine powders, adding small amount of water, heating at 80-90 degrees C, stirring for 5-10 minutes, cooling to 30 degrees C, adding silicate bacteria, Bacillus subtilis and photosynthetic bacteria into coffee solution, uniformly stirring, filtering, drying filtrate using air blower at 30-40 degrees C, crushing to obtain composite microbial inoculants, setting aside; mixing liquid fermentation and modified starch solution, stirring, drying into furnace at 110-130 degrees C for 20-30 minutes, cooling, screening through 200 mesh sieve, setting aside; and mixing step 2 and 3, drying at 35-45 degrees C, weighing, and packaging. The mass ratio of powder dissolved in water is 1:9 particularly diluting at 15-25 kg/acre which is sprayed into soil surface.