NOVELTY - Controlled-release fertilizer comprises traditional Chinese medicinal residue, river sand, dairy manure, coal ash, sweet potato residue, rice hull, bio-fermentation agent, maifanite powder, potassium phosphate, potassium permanganate, ammonium phosphate, calcium nitrate, ammonium sulfate, alkyd resin, propanol, sodium dodecylbenzenesulfonate, cross-linking agent and water. The cross-linking agent comprises butyl acrylate, tributyl citrate, rosin powder, green papaya powder, N,N-methylenebisacrylamide, ethanol, shellac powder and water.    USE - The controlled-release fertilizer is useful for planting grape vines (claimed).    ADVANTAGE - The fertilizer slowly releases nutritional components, is rich in organic matters, and improves characteristics of soil. The frequent fertilization is avoided.    DETAILED DESCRIPTION - Controlled-release fertilizer comprises 40-45 pts. wt. traditional Chinese medicinal residue, 20-25 pts. wt. river sand, 60-75 pts. wt. dairy manure, 30-35 pts. wt. coal ash, 50-70 pts. wt. sweet potato residue, 30-36 pts. wt. rice hull, 2-3 pts. wt. bio-fermentation agent, 10-14 pts. wt. maifanite powder, 9-13 pts. wt. potassium phosphate, 3-5 pts. wt. potassium permanganate, 8-10 pts. wt. ammonium phosphate, 1-3 pts. wt. calcium nitrate, 8-12 pts. wt. ammonium sulfate, 8-12 pts. wt. alkyd resin, 2-3 pts. wt. propanol, 3-4 pts. wt. sodium dodecylbenzenesulfonate, 5-6 pts. wt. cross-linking agent and suitable amount of water. The cross-linking agent comprises 2-3 pts. wt. butyl acrylate, 3-5 pts. wt. tributyl citrate, 2-3 pts. wt. rosin powder, 5-7 pts. wt. green papaya powder, 1-2 pts. wt. N,N-methylenebisacrylamide, 4-5 pts. wt. ethanol, 1-2 pts. wt. shellac powder and suitable amount of water. The cross-linking agent is prepared by (i) mixing the ethanol and water in a ratio of 1:3, adding the rosin powder, butyl acrylate, N,N-methylenebisacrylamide and tributyl citrate, heating obtained mixture at 70-90 degrees C, and stirring the mixture, (ii) mixing the green papaya powder and shellac powder, adding 10 times water to mixture, and uniformly mixing and stirring mixture, and (iii) mixing products obtained in steps (i) and (ii), heating mixture for 20-30 minutes, and concentrating the mixture. An INDEPENDENT CLAIM is included for method for preparing the controlled-release fertilizer, which involves (a) mixing the traditional Chinese medicinal residue, river sand, dairy manure, coal ash, sweet potato residue and rice hull, drying obtained mixture, crushing the mixture to obtain powder having 160 mesh size, adding bio-fermentation agent and water to the powder, controlling water content of obtained mixture at 40%, fermenting the mixture at 38-43 degrees C for 20-24 days, and stirring the mixture once for every 2 days during fermentation, (b) mixing the potassium phosphate, potassium permanganate, ammonium phosphate, calcium nitrate and ammonium sulfate, adding 5-6 times water to mixture, heating and stirring mixture, adding the alkyd resin, sodium dodecylbenzenesulfonate, propanol and cross-linking agent to mixture, and heating and stirring mixture for 10-15 minutes, (c) adding the maifanite powder to mixture obtained in step (b), heating and stirring mixture for 30-40 minutes, solidifying and naturally cooling the mixture, and crushing the mixture to obtain powder having 20 mesh size, and (d) mixing products obtained in steps (a) and (c), controlling water content of obtained mixture at 20%, and pelletizing the mixture.