NOVELTY - An aqueous solution of bivalent iron source, aqueous solution of lithium source and aqueous solution of phosphorus source are stirred. An organic carbon source is added to obtained precursor powder, and evenly stirred. The inorganic carbon source is mixed with nanocrystalline lithium-iron phosphate anode material covered by organic carbon, and adhesive is added to mixture. The nanocrystalline lithium-iron phosphate anode slurry is coated on aluminum-foil substrate, dried and pressed to obtain nanocrystalline lithium-iron phosphate anode material covered by carbon.    USE - Preparation of nanocrystalline lithium-iron phosphate anode material.    ADVANTAGE - The method provides battery having discharge capacity of 155-165 mAh/g and flat discharge platform.    DETAILED DESCRIPTION - An aqueous solution of bivalent iron source, aqueous solution of lithium source and aqueous solution of phosphorus source are stirred at rate of 3000-50000 rpm and 15 degrees C or less for 30-120 minutes to obtain precursor solution. The atomic ratio of iron, lithium and phosphorus in precursor solution is 1:1-1.1:1-1.1. The concentration of aqueous solution of bivalent iron source, aqueous solution of lithium source and aqueous solution of phosphorus source is 0.05-5 mol/L. The precursor solution is stewed for more than 10 minutes, cleaned with deionized water, filtered and dried to obtain precursor powder. An organic carbon source is added to precursor powder, and evenly stirred at rate of 3000-50000 rpm using water. The mixture is dried to obtain precursor powder covered by organic carbon source. The addition quantity of organic carbon source is 3-80 wt.% of weight of precursor powder. The precursor powder covered with organic carbon source is heated at rate of 1-30 degrees C/minute under non-oxidizing atmosphere protection, roasted at constant temperature for 1-10 hours, and cooled to room temperature at rate of 1-30 degrees C/minute to obtain nanocrystalline lithium-iron phosphate anode material covered by organic carbon. The inorganic carbon source is mixed with nanocrystalline lithium-iron phosphate anode material covered by organic carbon, and adhesive is added to mixture and evenly stirred at rate of 3000-50000 rpm to obtain nanocrystalline lithium-iron phosphate anode slurry covered by carbon. The content of inorganic carbon source in mixture is 2-40 %mass. The addition quantity of adhesive is 2-20 %mass. The adhesive is Teflon (RTM: polytetrafluoroethylene), polyvinylidene fluoride or styrene-butadiene copolymer. The nanocrystalline lithium-iron phosphate anode slurry is coated on aluminum-foil substrate, dried and pressed to obtain nanocrystalline lithium-iron phosphate anode material covered by carbon.