NOVELTY - Organic ecological soil conditioner comprises 60-70 wt.% fermented straw and auxiliary materials which are formed by combining animal ripening fertilizer, cake fertilizer, organic fertilizer and strain, where the strain is chosen from actinomycetes, edible fibers producing bacteria, Polymyxa and mycetozoan, the animal ripening fertilizer is animal manure, the cake fertilizer is chosen from potato, pumpkin, soybean meal, peanut shell powder and corn powder and the organic fertilizer is chosen from nitrogen and other organic fertilizer.    USE - As organic ecological soil conditioner.    ADVANTAGE - The organic ecological soil conditioner, quantity and activity of soil microorganisms are increased, simultaneously when organic substances with high carbon and nitrogen (C/N) ratio are added in the soil, the organic substances have complicated biochemistry reaction with carbon pool and nitrogen pool which originally exist in the soil, the circulation of carbon and nitrogen in the soil can be greatly changed, the soil respiration and carbon dioxide emission are increased, a good temperature effect is provided for growth of crop roots, and the organic ecological soil conditioner has a remarkable improving effect on the soil structure.    DETAILED DESCRIPTION - Organic ecological soil conditioner comprises 60-70 wt.% fermented straw and auxiliary materials which are formed by combining animal ripening fertilizer, cake fertilizer, organic fertilizer and strain, where the strain is chosen from 15-25 wt.% actinomycetes, 20-35 wt.% edible fibers producing bacteria, 15-25 wt.% Polymyxa and 15-25 wt.% mycetozoan, the animal ripening fertilizer is 40-45 wt.% animal manure, the cake fertilizer is chosen from 15-20 wt.% potato, 10-20 wt.% pumpkin, 10-20 wt.% soybean meal, 5-8 wt.% peanut shell powder and 5-8 wt.% corn powder and the organic fertilizer is chosen from 2-4 wt.% nitrogen and 3-5 wt.% other organic fertilizer. An INDEPENDENT CLAIM is included for method for preparing the soil conditioner, which involves (a) piling and fermenting the straw for 30-40 days and cutting the fermented straw into 6-10 cm, (b) adding the straw with the above-mentioned strains and again piling and fermenting the straw for 24-30 hours, (c) drying the obtained product until the moisture content is 30-35%, and mixing the dried product with the above-mentioned auxiliary materials.