The invention discloses an oil sunflower special fertilizer based on soda saline soil. The oil sunflower special fertilizer is prepared by blending the following components serving as raw materials in parts by weight: 10-30 parts of biochemical fulvic acid, 5-15 parts of magnesium slag, 5-15 parts of pyrite cinders, 5-20 parts of sunflower seed cake meals, 10-30 parts of urea, 10-15 parts of ammonium sulfate, 10-20 parts of ammonium phosphate, 10-30 parts of potassium sulfate, 1-5 parts of zinc sulfate, 1-5 parts of manganese sulfate, 1-5 parts of poly-boron and 1-5 parts of a granulation binder. According to the oil sunflower special fertilizer disclosed by the invention, aiming at the characteristics of strong alkalinity, high degree of alkalization and poor physical and chemical properties of the soda saline soil, and considering a nutritional requirement rule of oil sunflowers, organic and inorganic matters are combined together, macro-elements are combined with medium elements and microelements, the nutrition is overall and balanced, the nutrition necessary for the whole growth stages of the oil sunflowers can be provided, meanwhile, the pH value of the soda saline soil is reduced, the soil structure is improved, and the soil fertility is improved, so that the output and quality of the oil sunflowers are significantly improved.