The invention discloses a refining method of valsartan. The method comprises the following steps: by using acetoacetic acid as a solvent, putting valsartan into the solvent, regulating the pH value of the solution to 3.0-5.0, heating the solution to 40 DEG C, quickly stirring until the solid is completely dissolved, carrying out ultrasonic dispersion on the solution, quickly filtering the solution, taking the filtrate, adding phthalate into the filtrate, quickly stirring for 5 minutes, stopping stirring, standing for 25-30 minutes, cooling to 0 DEG C or below to precipitate a crystal, filtering, heating the obtained crystal again in an acetoacetic acid solution to dissolve the crystal, stirring for 5 minutes, standing for 25-30 minutes, cooling to 0 DEG C or below to precipitate a crystal, and filtering, thereby finally obtaining the valsartan refined product. The valsartan refined product prepared by the method has the advantages of high product yield (90.1% or above) and high purity (99.86% or above).