NOVELTY - NOVELTY u Biological fertilizer comprises 30-50 mass% of shale, 5-15 mass% of starch or brown sugar, 0.5-0.25 mass% of bone powder, 10-25 mass% of bean cake, 5-20 mass% of dry chicken manure, 17-30 mass% of ferment bacteria and 0.1-0.6 mass% of mountain soil.    USE - The biological fertilizer is useful for decomposing insoluble phosphate in agriculture.    ADVANTAGE - The fertilizer is cost-effective and environment-friendly, and improves crop yield.    DETAILED DESCRIPTION - Biological fertilizer comprises 30-50 mass% of shale, 5-15 mass% of starch or brown sugar, 0.5-0.25 mass% of bone powder, 10-25 mass% of bean cake, 5-20 mass% of dry chicken manure, 17-30 mass% of ferment bacteria and 0.1-0.6 mass% of mountain soil, where the mountain soil is derived from viscous and cation-exchange capacity value of the soil, the starch and brown sugar is derived from corn starch, potato flour or sweet potato powder, the bean cake in sugar is soybean oil cake, colza cake or peanut oil cake, the bone powder is animal bone powder i.e. pig bone powder, fish bone powder or cattle bone powder, and the ferment bacteria is Bacillus subtilis, bacterial polysaccharide, Rhizopus oryzae, Pichia pastoris or Sphingobacterium. An INDEPENDENT CLAIM is included for preparing the biological fertilizer, comprising: (a) taking shale, dry chicken manure, bone powder, bean cake, starch or brown sugar, ferment bacteria and water as a raw materials; (b) mixing the starch or brown sugar with hot water 80-95 degrees C in a mass ratio of 1:50, crushing and stirring the mixture to obtain transparent paste at less than 50 degrees C, uniformly mixing the raw materials with the transparent paste, uniformly mixing and stirring the mixture to adjust the water content to 40-45%, and transferring the mixture into a tin covered with a cloth; (c) pile-turning the mixture for every day for 1-2 times at 50 degrees C for 48 hours; (d) fermenting the mixture for 7 days; and (e) spreading the mixture in a warm-air dried cement ground for 15 cm thickness, where the cement ground has a water content of 15%, and packaging.