A method for purifying 1-aminoanthraquinone which comprises previously subjecting a crude 1-aminoanthraquinone to a removal treatment of inorganic impurities so that their content is reduced to not more than 4 wt. % as converted to ash basis or to a removal treatment of iodine-consuming reductive inorganic impurities so that their content is reduced to not more than 2 wt. % as converted to consumed iodine basis, and then rectifying the 1-aminoanthraquinone.
