While a simple phosphate difluoromethyl high purity provides a method for producing a phosphate industrially advantageously manufacturable by-difluoro. Reacting the anhydrous hydrofluoric acid, etc. that does not include an organic solvent, and phosphorus oxo acid to produce phosphoric acid solution fluoro process; Under halides, carbonates, borates, absence of the phosphate, hydroxide and oxides of an alkali metal, which by the addition of a phosphate hexafluoride fluoro-phosphate solution, the phosphate generated in the fluoro-difluoro process phosphoric acid solution; And difluoro by a dry heated phosphoric acid solution as a fluoro containing phosphate, then by distilled off the acid fluoroalkyl processes, or crystallization to precipitate the phosphate as difluoro the phosphoric acid solution fluoro, high phosphate difluoromethyl separation, and further includes any one of fluoro step of removing phosphoric acid contained in the distillate as a phosphate difluoromethyl after solid-liquid separation.