NOVELTY - Treatment of livestock and poultry breeding polluted biogas liquor comprises flowing biogas liquor from biomass pond into first-stage precipitating tank, and adding microbial reagent e.g. Bacillus FB-1, into the tank; adding actinobacteria mycelium FC-2 as biological absorbent into the second-stage precipitating tank to absorb heavy metal; discharging biogas liquor into biological conversion pond, and adding filter-feeding fish and microbial reagent; and discharging treated biogas liquor after reaching the standard or using as agricultural irrigation water.    USE - Method for treating livestock and poultry breeding polluted biogas liquor (claimed).    ADVANTAGE - The method improves the conversion efficiency and realizes nutritious resource utilization of the biogas liquor with low investment and operation cost, simple operation, good treatment effect, wide application range and easy promotion in underdeveloped rural areas.    DETAILED DESCRIPTION - Treatment of livestock and poultry breeding polluted biogas liquor comprises (A) strengthened conversion of microbial reagent in a first-stage precipitating tank by making the biogas liquor flow from a biomass pond into the first-stage precipitating tank; adding microbial reagent such as Bacillus FB-1, photosynthetic bacteria reagent FP-1, Lactobacillus reagent FL-2, nitrifying bacteria reagent FN-1 and denitrifying bacteria reagent FD-1 into the tank, where the dosage of microbial reagent in per unit of the biogas liquor every day is as follows: FB-1: 1x 102-1x 103 colony forming unit (cfu)/mL/day; FP-1: 1x 103-1x 104 cfu/mL/day; FL-2: 1x 103-1x 104 cfu/mL/day; FN-1: 1x 102-1x 103 cfu/mL/day; and FD-1: 1x 103-1x 104 cfu/mL/day; and the addition interval is once every two days; (B) heavy metal removal by absorbent in a second-stage precipitating tank by making biogas liquor treated in first-stage precipitating tank enter into the second-stage precipitating tank; adding actinobacteria mycelium FC-2 as biological absorbent into the second-stage precipitating tank to absorb the heavy metal and then precipitate onto the tank bottom, where the dosage of actinobacteria mycelium FC-2 is 2-5 g/m3 in per unit of biogas liquor; and the addition interval is once every day; (C) discharging the biogas liquor treated by the precipitating tanks into the biological conversion pond; adding filter-feeding fish and the microbial reagent into the biological conversion pond to realize the efficient conversion of nutritious biogas liquor through filter-feeding function of the filter-feeding fish on planktonic algae, zooplankton and bacteria; regulating the water quality by bacillus FB-2, photosynthetic bacteria reagent FP-2 and nitrifying bacteria reagent FN-2, where the dosage of FB-2 is 1x 103-1x 104 cfu/mL/day; and the dosage of FP-1 is 1x 103-1x 105 cfu/mL/day; and (D) discharging the treated biogas liquor after reaching the standard or using the treated biogas liquor as agricultural irrigation water; regularly cleaning the biomass residue in precipitating tank; preparing the biomass residue in the first-stage precipitating tank into organic fertilizer applied to large farmland crops through solid compost; cleaning bottom sludge in the second-stage precipitating tank and then using the bottom sludge dried by wind as materials for constructing road or calcining brick.