The invention relates to the field of fertilizer, in particular to a chemical fertilizer special for sunflowers. The chemical fertilizer is prepared from, by weight, 20-25 parts of straw, 10-20 parts of saw dust, 10-12 parts of expanded perlite powder, 1-2 parts of nitrification inhibitor DMPP, 0.3-0.5 part of tea saponin, 26-28 parts of potassium nitrate, 21-23 parts of grain dreg fertilizer, 20-22 parts of calcium magnesium phosphate fertilizer, 18-20 parts of urea, 7-9 parts of oligosaccharins, 5-7 parts of photosynthetic bacterium fertilizer, 2-4 parts of bacillus preparation, 3-5 parts of crop straw decomposition preparation, 6-8 parts of humic acid compound fertilizer, 2-5 parts of boron dreg and 1-3 parts of zinc carbonate. The chemical fertilizer is complete in nutrient substance, the stalk of sunflower plants is effectively promoted to be thick and strong, the flower discs are large, grains are full and compact, the grains are high in mature degree, nutrient substance is contained in the formula, soil fertility is increased, environmental pollution is reduced, the yield of the sunflowers is greatly increased, and the quality of the sunflowers is greatly improved.