Method for preparing high-content creatine phosphate disodium salt

The invention discloses a method for preparing high-content creatine phosphate disodium salt, comprising the steps as follows: (1) conducting a condensation reaction on creatinine and phosphorus oxytrichloride to obtain crude creatinine phosphorus oxychloride; (2) dissolving the crude creatinine phosphorus oxychloride in a solvent A, then stirring and filtering, adding a solvent B to the filtrate to separate out the crystal and obtain fine creatinine phosphorus oxychloride; (3) hydrolyzing fine creatinine phosphorus oxychloride in sodium hydroxide aqueous solution to obtain the high-content creatine phosphate disodium salt, wherein the solvent A is halohydrocarbon and the solvent B is aliphatic hydrocarbon.