The invention relates to a
valine purification method, which comprises the following steps: A. adding flocculating agents into
valine fermentation liquid for fast precipitating
solid impurities, and obtaining primary filter liquid through filtering supernatant; B. adding
activated carbon into the primary filter liquid obtained in the step A, wherein the added
activated carbon accounts for 1+ / -0.5weight percent of the filter liquid, carrying out stirring and decoloration at 60 + / - 5 DEG C, and then, obtaining secondary filter liquid through
filtration; C. using an industrial
chromatographic column for separating inorganic salt and heteroacid, and then, using a
sodium filter membrane for removing
pigment and small molecular impurities to obtain a clear and colorless
valine solution; D. concentrating the filter liquid for
crystallization to obtain crude valine products; and E. shaking a
transmission belt and raising the temperature to 220 + / - 10 DEG C, and carrying out sublimation to remove
alanine and
isoleucine to obtain pharmaceutical grade competitive valine products. The method has the characteristics of simple operation, good selectivity, cleanness and environment protection, so the yield and the quality of the valine are obviously improved.