NOVELTY - An organic soil modifying agent manufactured from municipal sludge is formed from, on a weight ratio basis, dehydrated sludge (53-72%) and accretion which comprises agricultural and sideline products offal (4-18%), inorganic additives (2-15%), a fertilizer poising agent (1-5%) and a microorganism complex bacteria group (0.5-2%).    USE - As an organic soil modifying agent.    ADVANTAGE - The organic soil modifying agent regards the organic substance as a raw material, has rich nutrition, can improve rationalized structure of soil and quality of farm product, and can increase synthetical fertility of soil.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of preparing organic Krilium from municipal sludge, comprising:    (A) mixing dewatered sludge with water ratio of 70-83% and hatching by-product waste according to a volume ratio of 1:1-1:3, to prepare a mixing sludge whose water ratio reaches 52-66%;    (B) according to compost parameters (pH of 6-8.5, C/N of 25-35:1, and an organic substance content of 30-55%), mixing the mixing sludge, the fertilizer poising agent and a ferment fungus rapid-rotten agent equally according to 20-40% matching ratio of the microbial compound fungus group, and processing manure ferment according to a bottom of 3.0 m, a height of 1.5 m or a random length shaped as strip;    (C) after composting, increasing the temperature to 55-58degrees C for the first turning over and then turning over once for every 1-3 days, where the first ferment time is 3-7 days; and    (D) converting the material obtained after the first ferment in a storage silo of a heated floor system, adding a TV-1000 microbial fungus agent according to 50-80% matching ratio of the microbial compound fungus group to process the second ferment, evaporating water, keeping the temperature of the storage silo at 60-75degrees C, turning over once for every 2-4 days, finishing the second ferment after piling for 7-14 days, and sifting 5 mm to obtain an organic Krilium product.