NOVELTY - Preparing solid organic carbon fertilizer comprises e.g. adding biological crushing preparation into bio-organic waste water concentrate liquid, fully mixing the materials with fermenting strain powder, subjecting to pile-fermentation, cooling the pile-ferment material, spraying on the bio-organic wastewater concentrate liquid, at the same time adding the fermentation strain powder, mixing, subjecting the material to pile-fermentation, qualifying, cooling, transferring the pile-ferment material to high-building heap area, heating, slowly cooling, crushing the ferment material, and packaging.    USE - The method is useful for preparing solid organic carbon fertilizer (claimed).    DETAILED DESCRIPTION - Preparing solid organic carbon fertilizer comprises (i) adding biological crushing preparation containing 45-55% water content as main material into 15 wt.% bio-organic waste water concentrate liquid, fully mixing the above-mentioned materials with 0.5% fermenting strain powder, then subjecting to pile-fermentation to obtain material having direct high pile of 1-1.2 m, where the bio-organic wastewater concentrate liquid is a mixed liquid of alcohol waste liquor having water content of 45-55% and pH value of 4-6, monosodium glutamate waste liquid, yeast waste liquid and/or paper making black liquid, the fermentation strain powder is biological humic acid powder or straw stick rotten powder, the pile-ferment material is not turned for 6-8 days after pile-fermentation, and continuously subjecting the material to pile-fermentation at more than 60 degrees C for 72 hours; (ii) cooling the resulting pile-ferment material, spreading, spraying on the 18-25 wt.% bio-organic wastewater concentrate liquid, at the same time adding the fermentation strain powder, mixing uniformly, building a pile having height of 1-1.2 m after the material subjected to pile-fermentation, where the pile-ferment material is turned for 6-8 days after pile-fermentation, continuously subjecting the material to pile-fermentation at temperature at more than 60 degrees C for 72 hours, and qualifying; (iii) cooling the resulting pile-ferment material, transferring the pile-ferment material to a high-building heap area of 2.5-3 , stewing to dry the heap, fermenting for 20-30 days without turning, heating, and then slowly cooling; and (iv) stewing to dry the pile-ferment material until its moisture content is 30%, opening the resulting stack, crushing the ferment material, and packaging.