The invention relates to a preparation method of 4, 4'-dia(4-aminophenoxy)-3, 3', 5, 5'-tetramethylbenzene, which comprises that 3, 3', 5, 5'- tetramethyl-4', 4'-
biphenyl diphenol, and 4- halogenated
nitrobenzene, in salt forming agents, strongly polar protonic or
water insoluble organic solvent system, are heated, refluxed and divided, concentrated , cooled, and added with water, while the product is precipitated, filtered, washed, and dried to obtain 4, 4'-dia(4-aminophenoxy)-3, 3', 5, 5'-tetramethylbenzene, and the 4, 4'-dia(4-aminophenoxy)-3, 3', 5, 5'-tetramethylbenzene in the reduction
system of
ferric chloride / 20-85% hydrazine
hydrate, the cooperation of
alcohol solvent and
active carbon, is reacted to obtain final product. The invention has simple and environment-friend operation, which can be used for industrialization production, while the product can reach more than 99% of purity, and the
solvent can be reclaimed.