NOVELTY - Organic-inorganic complex fertilizer, is claimed. The fertilizer is prepared by e.g. taking selected human and animal excrement, magnesium sulfate solution, ferrous sulfate solution, basalt and peat soil, (ii) mixing human and animal excrement, magnesium sulfate solution and ferrous sulfate solution, fermenting, and performing solid-liquid separation, (iii) mixing basalt, peat soil and biogas residue, (iv) detecting nitrogen, phosphorus pentoxide and potassium oxide and organic matter in residue, and (v) adding nitrogenous, phosphate and potassium fertilizer to form mixture material.    USE - The organic-inorganic complex fertilizer is useful for economic crops.    ADVANTAGE - The fertilizer: makes use of human and animal excrement which removes harmful substance to generate marsh gas fuel, basalt for improving release rate of fertilizer nutrient and peat soil for improving the content of organic matter; increases the yield of kiwi fruit, mulberry leaf and tea leaf by 7-15%; improves nitrogen utilization rate by 5-7%; and reduces fertilizer loss and harm to the environment.    DETAILED DESCRIPTION - Organic-inorganic complex fertilizer, is claimed. The fertilizer is prepared by taking (in parts by wt.) selected human and animal excrement (200-300), 3.85% magnesium sulfate solution (1), 20% of ferrous sulfate solution (1), basalt (10) and peat soil (50), (ii) mixing human and animal excrement, magnesium sulfate solution and ferrous sulfate solution in a biogas tank, fermenting for 45-50 days, increasing the temperature to 75-85 degrees C, and performing solid-liquid separation to obtain residue and biogas slurry, and taking the biogas residue for further use, (iii) mixing basalt, peat soil and biogas residue, (iv) detecting nitrogen, phosphorus pentoxide and potassium oxide and organic matter in biogas residue, (v) adding nitrogenous fertilizer, phosphate fertilizer and potassium fertilizer to form mixture material according to the above detection result, where the content of nitrogen, phosphorus pentoxide, potassium oxide and organic matter is 10:20:20:50, (vi) uniformly mixing, and (vii) granulating the mixture.