NOVELTY - Aquatic fertilizer comprises urea, potassium phosphate, ammonium phosphate, probiotics, composite phagostimulant, Chinese herbal medicine additive, soy lecithin, fish meal and nanocarrier. The nanocarrier is prepared by adding the silicon-substituted hydroxyapatite, attapulgite, hydrotalcite, montmorillonite, titanium dioxide pigment, calcite, kaolin to obtain a mixed solution, adding dimethyl sulfoxide (DMSO) and methanol to the mixed solution, stirring, filtering, washing with hot ethanol, drying, grinding and sieving to obtain a first modified compound.    USE - Aquatic fertilizer.    ADVANTAGE - The aquatic fertilizer has slow release function, sterilizing effect, and can be prepared in a simple, rapid and eco-friendly manner.    DETAILED DESCRIPTION - Aquatic fertilizer comprises 20-30 pts. wt. of urea, 10-15 pts. wt. of potassium phosphate, 16-23 pts. wt. of ammonium phosphate, 0.5-1.5 pts. wt. of probiotics, 1-3 pts. wt. of Chinese herbal medicine additive , 0.2-0.8 pts. wt. of composite phagostimulant, 55-70 pts. wt. of soy lecithin, 10-85 pts. wt. of fish meal and 20-25 pts. wt. of nanocarrier. The nanocarrier is prepared by adding the silicon-substituted hydroxyapatite, attapulgite, hydrotalcite, montmorillonite, titanium dioxide pigment, calcite and kaolin in weight ratio of 35-45:10-15:10-15:8-10:8-10:7-8:5-7 to obtain a mixed solution, adding 230 pts. wt. of DMSO and 50 pts. wt. of methanol to the mixed solution, stirring at 60 degrees C for 65 hours, filtering, washing with hot ethanol at 60 degrees C for 3 times to remove excess of DMSO, placing into a vacuum drying box, then drying at 60 degrees C for 24 hours, grinding and sieving to obtain a first modified compound, adding 1 pts. wt. of first modified compound, 15 pts. wt. of potassium acetate and 25 pts. wt. of distilled water, stirring at 50 degrees C for 10 hours, reducing the temperature to 30 degrees C, dispersing under ultrasonic electric power of 350 W for 3.5 hours and then dispersing under the ultrasonic electric power condition 350 W for 4 hours. An INDEPENDENT CLAIM is included for preparing the aquatic fertilizer comprising weighing the each Chinese herbal medicine additive , crushing, adding 3 times of water, extracting at 80 degrees C for 3 hours, extracting for 2 times and combining the extracts to obtain a Chinese herbal medicine additive extract, concentrating and spray drying to obtain the Chinese herbal medicine additive, mixing the urea, potassium phosphate, ammonium phosphate, probiotics, composite phagostimulant, Chinese herbal medicine additive, soy lecithin, fish meal and nanocarrier, then feeding the mixture into a fermentation tank, adding 50 wt.% of water, then adding 1-2 wt.% of dry yeast, 1.5-2 wt.% of Aspergillus niger and 2.5-3 wt.% of Bacillus, fermenting at 23-27 degrees C for 8 days and filtering to obtain filter residue, freeze drying the filter residue and crushing.