Method of purifying terephthalaldehydic

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The present invention relates to a method for purifying terephthalaldehyde which comprises a first step of dissolving terephthalaldehyde containing impurities in an aromatic solvent at high temperature to prepare a solution; and a second step of quenching the solution to re-crystallize it into terephthalaldehyde. In accordance with the present invention, high pure terephthalaldehyde may be economically prepared.