A water-soluble
fertilizer. The invention belongs to the field of a
crop fertilizer and specifically relates to a nano-scale multi-
nutrient water-soluble
fertilizer. The water-soluble fertilizer is composed of
urea, monoammonium
phosphate,
potassium dihydrogen
phosphate, Chinese medical stone,
dolomite and other additives. The water-soluble fertilizer is prepared by the following steps: firstly micronizing Chinese medical stone and
dolomite and carrying out water
dissolution treatment, dissolving the mixture in water and simultaneously adding
urea, monoammonium
phosphate and
potassium dihydrogen phosphate to be dissolved together, sending the mixture into a
high pressure homogenizer for homogenization and refining to nanometers, adding the additives and mixing, concentrating and crystallizing, filtering and
drying, crushing and packaging to obtain the nano-scale multi-
nutrient water-soluble fertilizer. The water-soluble fertilizer has advantages of uniform color and
granularity, adequate
nutrient and fine particles and helps plants absorb nutrients. By the use of the water-soluble fertilizer, absorption and utilization of the fertilizer are raised for crops. Meanwhile,
soil structure can be improved. Soil hardening is prevented, soil
granulation is enhanced, microbial activity of
plant roots is raised, and product quality of crops is promoted. The water-soluble fertilizer has good water
solubility, is irrigated with water, will not block pipelines, and is suitable for integration of water and fertilizer.