The invention provides a fertilizer for maintenance of flowers. The fertilizer is prepared by the following raw materials in parts by weight: 3-7 parts of oil cakes; 0.2-0.9 parts of Chinese medicine residues; 0.1-0.3 parts of water-chestnut pieces and pigs and cleats; 1-2 parts of plant ash and potassium sulfate; 0.3-0.8 parts of calcium superphosphate and soil; 1-2 parts of monosodium glutamate leftovers and ammonium sulfate; 0.01-0.05 parts of ferrous sulphate; 0.01-0.05 parts of borax; 1-4 parts of charcoal powder and humic acid; and 0.3-0.7 parts of bamboo vinegar liquid. The fertilizer has the beneficial effects that proportioning of fertilizer raw materials is adjusted, so that flower forestation is strong, stress resistance and disease resistance of flowers are improved, at the same time organic substance nutrients are the fundamental, inorganic nutrients are blended, the flower stems and leaves are emerald green for a long time, the flowers are very large and gorgeous, and the ornamental value and economic values of the flowers are improved.