NOVELTY - Organic water-retaining and heat-preserving liquid corn fertilizer in plastic film includes cypress powder, talc powder, composite microbial inoculants, modified starch solution, seaweed powder, coffee beans, soybean powder, and water. The composite microbial inoculants comprises silicate bacteria, Bacillus subtilis and photosynthetic bacteria. 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 - Organic water-retaining and heat-preserving liquid corn fertilizer in plastic film used for increasing corn yield (claimed).    ADVANTAGE - The fertilizer reduces water evaporation which increases water usage efficiency, improves soil aggregate structure and enzyme activities, and increases soil organic content.    DETAILED DESCRIPTION - Organic water-retaining and heat-preserving liquid corn fertilizer in plastic film comprises 23-27 pts. wt. cypress powder, 8-12 pts. wt. talc powder, 2-4 pts. wt. composite microbial inoculants, 13-16 pts. wt. modified starch solution, 28-32 pts. wt. seaweed powder, 6-8 pts. wt. coffee beans, 36-40 pts. wt. soybean powder, and water. The ratio of composite microbial inoculants which comprises silicate bacteria, Bacillus subtilis and photosynthetic bacteria is 2:1:1. 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 organic water-retaining and heat-preserving liquid corn fertilizer in plastic film comprising mixing powders of seaweed powder, soybean, cypress and talc into fermentation tank, adding adequate water, maintaining moisture content of 50-60%, fermenting 3-4 weeks, taking out fermented material, pressing to obtain liquid fermentation; drying coffee beans at 55-65 degrees C, crushing into fine powders, adding small amount of water, heating at 70-90 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 40-60 degrees C, crushing to obtain composite microbial inoculants in soluble coffee powder, setting aside; mixing liquid fermentation with modified starch solution, uniformly stirring, drying into furnace at 110-130 degrees C for 15-20 minutes, cooling, screening through 200 mesh sieve, setting aside; and mixing step 2 and 3, adding remaining raw materials, drying at 60-80 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.