NOVELTY - Producing highly water soluble nitrophosphate fertilizer through nitric acid decomposition of phosphate ammonium sulfate cycle comprises e.g. mixing nitric acid with filtering and washing liquid, adding the mixture into an acidolysis tank, stirring, adding ground phosphate rock, performing acidolysis, filtering the slurry, washing by using clean water, returning the washing liquid to be mixed with the nitric acid to decompress the ground phosphate rock, combining the filtrate with returned washing liquid, adding ammonium sulfate, performing double decomposition, and filtering the product.    USE - The method is useful for producing highly water soluble nitrophosphate fertilizer through nitric acid decomposition of phosphate ammonium sulfate cycle.    ADVANTAGE - The method: discharges little wastes, is ecofriendly, restructures the traditional phosphorus industry, can produce good economical and environmental benefits, and produces product which has high water dissolution rate up to greater than or equal to 99.9%, is easily absorbed by the plant, meets the requirements of the economic plants, and has high utilization rate, increases the yield of plant up to 8-25%, and increases the quality of the plant product.    DETAILED DESCRIPTION - Producing highly water soluble nitrophosphate fertilizer through nitric acid decomposition of phosphate ammonium sulfate cycle comprises: mixing nitric acid with a filtering and washing liquid, adding the mixture into an acidolysis tank, stirring, adding ground phosphate rock to the mixture, performing acidolysis, filtering the slurry, washing by using clean water, returning the washing liquid to be mixed with nitric acid to decompress the ground phosphate rock; (ii) combining the filtrate with the returned washing liquid, adding ammonium sulfate, performing double decomposition, filtering the reaction product to obtain calcium sulfate dehydrate, washing by using clean water, diluting the acidolysis filtrate by using the washing liquid, where the resulting phosphoric acid and ammonium nitrate is left over in the filtrate; (iii) neutralizing the filtered liquid by using aqueous ammonia until the pH is 6.5-7, filtering, separating the precipitate, and discharging the filtered residue; (iv) evaporating and concentrating the neutralized filtered liquid, cooling and crystallizing in a crystallizer to obtain nitrophosphate fertilizer slurry, and centrifuging to obtain the nitrophosphate fertilizer product, returning the mother liquor to the system, evaporating and concentrating the system; and (v) adding water into phosphogypsum and pulping, performing conversion reaction by adding ammonia and carbon dioxide, conveying the slurry into a filter to obtain calcium carbonate, drying the calcium carbonate, and returning the ammonium sulfate filtrate into the system.