NOVELTY - Preparing bio-organic fertilizer, comprises (i) taking tomato stalks, animal manure, pond sludge, straw rot agent and water; (ii) diluting straw rot agent by adding water, uniformly spraying on tomato stalks, and covering a thin film; (iii) mixing tomato stalks with animal manure, and mixing pond sludge with water; (iv) piling mixed material, and tightly covering with plastic film while carrying out anaerobic fermentation; (v) carrying out enzymolysis of the fermented mixture by drying; and (vi) packaging the bio-organic fertilizer raw material to obtain the product.    USE - The method is useful for preparing bio-organic fertilizer (claimed).    ADVANTAGE - The method produces product rich in organic matter, nitrogen, phosphorus and potassium and other nutrients, which are suitable for varieties of crops and variety of common soil fertilizer; improves the product quality; increases the yield, industrial added value, and the income of the farmer's; reduces the utilization of chemical fertilizer, and simultaneously, transforms a large amount of tomato quality by using tomato stalk; reduces emissions into atmosphere while burning; improves the quality of soil and water; is environmental friendly; extends industrial chain; and utilizes multi-level value-added agricultural resources.    DETAILED DESCRIPTION - Preparing bio-organic fertilizer, comprises (i) taking 67.5% tomato stalks having water content of less than 15%, 16% animal manure having water content of less than 10%, and 16% pond sludge having water content of less than 20%, 0.5% straw rot agent and water (suitable amount); (ii) diluting straw rot agent by adding water, uniformly spraying on tomato stalks, and covering a thin film on the tomato stalks, and obtaining irregular segments of rot tomato stalks, after 6-10 days; (iii) mixing tomato stalks with animal manure, and mixing pond sludge by adding water, and adjusting the moisture content in the mixture at 55-60%; (iv) piling the mixed material, tightly covering the mixed material by using a plastic film while carrying out anaerobic fermentation, and collecting the soft and flexible mixture once the mixture turns brown or dark brown color, and completing the fermentation process; (v) carrying out enzymolysis of the fermented mixture by drying until the water content is less than 10% at 60 degrees C to obtain bio-organic fertilizer raw material; and (vi) packaging the bio-organic fertilizer raw material to obtain the product.