Preparation method of H12MDA (diaminodicyclohexylmethane)

The invention discloses a preparation method of H12MDA (diaminodicyclohexylmethane). According to the method, MDA (diaminodiphenyl-methane) is used as a raw material; in a hydrogenation reaction, the acidity of a phenolic compound is used for improving the catalyst activity; the generation of high-boiling-point tar in the reaction process is reduced; meanwhile, high-boiling-point tar covering the surface of the catalyst can be effectively brought out of a reaction system by a phenolic compound hydrogenation product of alicyclic alcohol type compounds; the problem of filtering difficulty due to high-boiling-point tar adsorption due to high-boiling-point tar adsorption on the surface of the catalyst can be solved; the reaction yield of H12MDA is improved, so that the activity of the catalyst can be greatly improved; the production efficiency is improved.