Water-soluble nutrient fertilizer, and preparation method and application thereof

The invention provides a water-soluble nutrient fertilizer, and a preparation method and application thereof. The composition consists of the following components in parts by weight: 10-15 parts of diammonium phosphate, 2-4 parts of dicyandiamide, 20-30 parts of urea, 15-20 parts of potassium chloride, 2-6 parts of ferrous sulfate, 4-5 parts of calcium oxide, 3-5 parts of magnesium sulfate, 4-8 parts of ammonium molybdate, 3-6 parts of cobalt chloride, 3-5 parts of boric acid, 2-6 parts of chelated zinc, 40-50 parts of water, 4.5-8.5 parts of a first surfactant and 3-10 parts of a second surfactant. Compared with the prior art, the water-soluble nutrient fertilizer disclosed by the invention contains beneficial trace elements, is good in overall quality, long in fertilizer efficiency and high in nutrient absorption and utilization rate, and is safe and environmentally friendly, and the problem that the utilization rate of mixed fertilizers and pesticides is low due to the fact that traditional water-soluble n