Duck manure and urea can be applied to Chinese cabbage at the same time. A special water-retaining slow-release fertilizer for Chinese cabbage is prepared from rapeseed meal, carbonized straw, peat, duck manure, Pleurotus ostreatus residue, urea, diammonium phosphate, calcium superphosphate, potassium sulfate, potassium chloride, potassium nitrate, polyamino acid, magnesium hydroxide, quicklime, trace elements, water-retaining slow-release fertilizer, Bacillus subtilis, Bacillus licheniformis, yttrium nitrate, rotenone, nano tea polyphenols, etc. The special slow-release fertilizer for vegetables has reasonable formula and good slow-release effect, which can promote the growth of Chinese cabbage and improve its quality at the same time.