NOVELTY - A composted fermented organic fertilizer comprises fermentation material mixture comprising (pts.wt.) Eichhornia crassipes (70-80), animal manure (11-13), cane sugar filter slurry (13-17), urea (0.3-1), calcium magnesium phosphate fertilizer (2-2.8), and bacterial strain (0.05-0.15) comprising aerobic bacteria and anaerobic bacteria. The cane sugar filter slurry is dry sediment product obtained after filtering pressed sugar cane juice from cane sugar production. The animal manure comprises dry organic material comprising dairy manure, sheep manure, pig manure or chicken manure.    USE - Composted fermented organic fertilizer.    ADVANTAGE - The fertilizer is rich in nutrients, and has wide raw material source, and easy and practical manufacturing method.    DETAILED DESCRIPTION - A composted fermented organic fertilizer comprises fermentation material mixture comprising (pts.wt.) Eichhornia crassipes (70-80), animal manure (11-13), cane sugar filter slurry (13-17), urea (0.3-1), calcium magnesium phosphate fertilizer (2-2.8), and bacterial strain (0.05-0.15). The Eichhornia crassipes is fresh dry raw material and is crushed into short material with length less than 1 cm. The cane sugar filter slurry is dry sediment product obtained after filtering pressed sugar cane juice from cane sugar production. The animal manure comprises dry organic material comprising dairy manure, sheep manure, pig manure or chicken manure. The urea conforms to GB2440 requirement. The calcium magnesium phosphate fertilizer conforms to GB20412 requirement. The bacterial strain is used for elevating temperature in fermentation and for deodorizing and comprises aerobic bacteria and anaerobic bacteria. An INDEPENDENT CLAIM is included for preparation of the fertilizer, comprising: (A) drying fresh Eichhornia crassipes, and crushing into short material with length less than 1 cm; (B) preparing auxiliary materials comprising cane sugar filter slurry, cow, goat, pig or chicken manure, urea, calcium magnesium phosphate fertilizer, and bacterial strain; (C) uniformly mixing the crushed Eichhornia crassipes and the auxiliary materials except the bacterial strain to obtain fermentation raw material mixture, controlling water content of the fermentation raw material mixture to 50-55%; (D) composting the fermentation raw material mixture by dividing the fermentation raw material mixture into three layers, and uniformly adding bacterial strain to form raw material compost with width of 150 cm, height of 100 cm and length of greater than or equal to 100 cm, where the interval between each two layers is 25 cm, and the total amount of the bacterial strain added to the three layers is 0.05-0.15 pts.wt.; (E) covering the compost with black film, and fermenting naturally such that when the bacterial strain is aerobic bacteria, the raw material compost top is covered with black film, and when the bacterial strain is anaerobic bacteria, covering four sides and top with black film; (F) when the temperature of the material in the compost is increased to 40 degrees C, turning the material for the first time, when the temperature is increased to more than 55 degrees C, not turning the material, when the temperature is less than or equal to 40 degrees C, turning again, then adding amount of water, maintaining the composting humidity to 50-55%, covering the entire material with black film, and maintaining the temperature at more than 55 degrees C; and (G) after composting for 2 months, gradually lowering the material temperature in the compost to 55 to 40 degrees C, dividing the compost, and drying till water content is less than or equal to 20%.