NOVELTY - Harmless extracting technique of agricultural biochemical fulvic acid using livestock and poultry excrement, comprises using livestock and poultry excrement fermented materials to extract fulvic acid, using Fenton's reagent, which is acid-soluble extracting agent, carrying out acid-soluble extraction of fulvic acid, and Fenton oxidation degradation process, separating and purifying yellow, black, and brown fulvic acid, and removing residual antibiotic, hormone, pesticide and bacteria, rot bacteria and parasite eggs in fulvic acid extraction materials through Fenton reaction degradation.    USE - The method is useful for harmless extracting technique of agricultural biochemical fulvic acid using livestock and poultry excrement (claimed).    ADVANTAGE - The method comprises Fenton oxidation degradation reaction, which quickly degrades and removes the residual antibiotic, hormone, pesticide and pathogenic bacteria, rot fungi and parasites, thus providing harmless extracting effect.    DETAILED DESCRIPTION - Harmless extracting technique of agricultural biochemical fulvic acid using livestock and poultry excrement, comprises using livestock and poultry excrement fermented materials to extract fulvic acid and using Fenton's reagent, which is acid-soluble extracting agent, carrying out extraction process, which is acid-soluble extraction of fulvic acid, and Fenton oxidation degradation process, after the acid-soluble extraction, separating and purifying yellow fulvic acid, black fulvic acid, brown fulvic acid, and removing residual antibiotic, hormone, pesticide and bacteria, rot bacteria and parasite eggs in fulvic acid extraction materials through Fenton reaction degradation. The method specifically comprises (a) using livestock and poultry excrement of pigs, cattle, chickens and other livestock and poultry excrement as the main raw material, and adding microbial inoculum for fermenting livestock and poultry excrement fermentation material, (b) preparing Fenton reagent using pH less than or equal to 2 dilute inorganic acid solvent, where the pH less than or equal to 2 dilute inorganic acid solvent are respectively divided into A and B two groups, the group A is pH value less than or equal to 2, comprising 0.5-2.5% ferrous sulfate and 1-2.5% sulfuric acid solution, and group B is pH value less than or equal to 2 comprising 15% hydrogen peroxide and 1-2.5% sulfuric acid solution, dissolving ferrous sulfate and hydrogen peroxide in acid solvent to obtain A and B two groups acid extraction agent, mixing together to obtain Fenton reagent and producing Fenton reaction, (c) carrying out acid-soluble extraction of fulvic acid by using fulvic acid soluble at pH less than or equal to 2 of acid solution according to different pH value and soluble and insoluble characteristics, and using black fulvic acid and brown fulvic acid insoluble at pH less than or equal to 2, adding group A acid soluble extraction agent containing 0.1-2.5% ferrous sulfate, and pH less than or equal to 2 1-2.5% sulfuric acid, adding fermented livestock manure with the group A acid extracting agent according to ratio of 1:5-15 to obtain suspension solution, stirring at room temperature and extracting for 30-60 minutes, eluting fulvic acid from livestock and poultry excrement fermentation material, and the acidic medium insoluble black fulvic acid, and brown fulvic, then separating and purifying yellow fulvic acid, black fulvic acid, and brown fulvic acid, eluting fulvic acid containing organic acid and chelating with ferrous ions, (d) carrying out Fenton oxidation degradation process, which is a harmless treatment technology by mixing acid-soluble extractive material with pH less than or equal to 2 group B acid soluble extraction agent containing 15% hydrogen peroxide, and 1-2.5% sulfuric acid, controlling fulvic acid extract containing 0.5-3% hydrogen peroxide, mixing two groups of materials, catalyzing hydrogen peroxide with ferrous ion to produce the Fenton reaction, chelating ferrous ion and fulvic acid, where the catalytic reaction was relatively mild, Fenton reaction time is longer, sterilizing residual antibiotic, hormone, pesticide and bacteria, rot bacteria and parasite ovum in fulvic acid extraction materials, and (e) solid-liquid separation of oxidation-degraded and sterilized material to obtain liquid material, which is fulvic acid and complex amino acid as water-soluble organic matter, and solid material, which is black fulvic acid, brown fulvic acid and fulvic acid as main insoluble organic material.