The invention relates to a fertilizer and a process for preparing the same, in particular to a green organic crop microorganism fertilizer. The microorganism fertilizer is characterized in that the microorganism fertilizer is prepared by the mix-fermentation of eight bacterial communities of photosynthetic bacteria, azotobacter, actinomycete, lactobacillus, yeast, root fixing bacteria, potassium bacteria and phosphorus bacteria, a plurality of beneficial microbial agents, coal gangue powder, lignite, straw carbon, humic acid, crop straw powder and excrement. Tests show that the microorganism fertilizer has obvious effect on the growth of corn, broomcorn, cereal, legume, paddy rice, fruits, flowers, pasture and the like, the production increasing rate is between 15 and 30 percent, and the microorganism fertilizer has obvious function on resisting diseases, lodging and insects, and can replace pesticide, fertilizer and hormone, avoid chemical pollution, improve soil fertility and product quality, and make the product become green or organic standards; and particularly, various crop straw and excrement are used as a carrier, thereby further lowering cost of the microorganism fertilizer and opening up a new path for the popularization and application of the microorganism fertilizer.