NOVELTY - Selenium-enriched composite fertilizer comprises cattle and sheep manure, urea, potassium chloride, calcium superphosphate, zinc sulfate, vinegar residue, cassava slag, potassium sulfate, ammonium chloride, sodium selenite, effective microorganisms (EM) microbial inoculum, and coating agent. The coating agent comprises chlorinated paraffin, KH-570 (RTM: gamma -methacryloyloxypropyltrimethoxysilane), nanocarbon, jade powder, and polyoxyethylene sorbitan monooleate.    USE - Selenium-enriched composite fertilizer used for seedless grapes (claimed).    ADVANTAGE - The composite fertilizer has balanced nutrition; not only improves sweetness and yield of seedless grapes, but also contains selenium-enriched raw material; increases food value of grapes; and is environmentally efficient and less harmful to soil.    DETAILED DESCRIPTION - Selenium-enriched composite fertilizer comprises 100-120 pts. wt. cattle and sheep manure, 40-45 pts. wt. urea, 20-23 pts. wt. potassium chloride, 30-34 pts. wt. calcium superphosphate, 2-3 pts. wt. zinc sulfate, 30-34 pts. wt. vinegar residue, 30-34 pts. wt. cassava slag, 18-20 pts. wt. potassium sulfate, 30-34 pts. wt. ammonium chloride, 2-3 pts. wt. sodium selenite, 3-4 pts. wt. zinc sulfate, 3-4 pts. wt. EM microbial inoculum, and 4-6 pts. wt. coating agent. The coating agent comprises 20-22 pts. wt. chlorinated paraffin, 2-3 pts. wt. KH-570 (RTM: gamma -methacryloyloxypropyltrimethoxysilane), 0.1-0.2 pt. wt. nanocarbon, 2-3 pts. wt. jade powder, and 2-3 pts. wt. polyoxyethylene sorbitan monooleate. The composite fertilizer is prepared by mixing raw materials, grinding, and uniformly dispersing. An INDEPENDENT CLAIM is included for composite fertilizer preparation by mixing cattle and sheep manure, vinegar residue and cassava slag, adding EM microbial inoculum and water, uniformly stirring, stacking, and fermenting for 6-8 days, while turning once every 2-3 days until fermentation material is completely decomposed; processing other raw materials excluding coating agent and mixing with fermented material; and heating obtained mixture to 80-90 degrees C, adding coating agent, uniformly mixing, and granulating.