NOVELTY - Method for preparing bio-organic fertilizer using excrements of livestocks on large scale involves mixing and briquetting straw, mushroom residue, bagasse and wood chips to prepare excrement blocks, (b) cushioning the excrement blocks at a bottom layer of a pigpen or farm, for collecting and primarily fermenting the excrements of livestock, (c) pumping the excrement blocks from pigpen or farm, and uniformly transporting to a fertilizer production factory for secondary fermentation, and (d) drying and crushing the fermented mixture and adding e.g. potassium fertilizer.    USE - The method is useful for preparing bio-organic fertilizer using excrements of livestocks on large scale (claimed).    ADVANTAGE - The method enables to prepare environmentally-friendly with high utilization ratio, which is simple in operation, and enables to shorten fermentation time of organic fertilizer and achieve large scale and mechanized production.    DETAILED DESCRIPTION - Method for preparing bio-organic fertilizer using excrements of livestocks on large scale involves mixing and briquetting straw, mushroom residue, bagasse and wood chips in a mass ratio of 20-30:5-10:10-2:5-10 to prepare excrement blocks of 300-500x 100-200x 20-30, (b) cushioning the excrement blocks at a bottom layer of a pigpen or farm, for collecting and primarily fermenting the excrements of livestocks, (c) after five to seven days, pumping the excrement blocks from the pigpen or the farm, and uniformly transporting to a fertilizer production factory for secondary fermentation, where the fermentation is performed by adding water to dissolve the microbial inoculum, urea, and calcium phosphate, performing fermentation at 50-55 degrees C with humidity of 50-60% for 5-10 days, the microbial inoculum includes Azotobacter, Bacillus cereus, B.megaterium, B.mucilaginosus, Candida candidautilis and Rhodopseudomonas palustris in a mass ratio of 1-2:1-2:0.5-1:0.5-1:0.5-1:1-2:0.5-2, the concentration of the microbial inoculum is 40-100, and (d) drying and crushing the fermented mixture and adding phosphorus, and potassium fertilizer.