The invention discloses an industrialized preparation method of 1,8-diaminonaphthalene, which comprises the following steps: sequentially adding a catalyst, dinitronaphthalene and a
solvent into a reaction kettle, stirring and heating materials in the reaction kettle to a temperature of 65-75 DEG C, slowly dripping hydrazine
hydrate, then continuously heating materials in the reaction kettle to the temperature of 75-90 DEG C and keeping the temperature for 3-8 hours until the end of the reaction; cooling the materials after the reaction to the temperature of 40-45 DEG C for pressure
filtration, washing and recovering the catalyst obtained through pressure
filtration, and mixing the washing liquid and the filtering liquid to obtain a feed liquid; conducting decompression and
desolvation on the feed liquid to recover the
solvent; adding hot water with the temperature of 50-80 DEG C into the desolventized feed liquid for
water washing stratification, wherein the upper layer is water phase and the lower layer is feed
liquid phase; feeding the feed
liquid phase obtained through stratification into a rectifying
tower for rectification, and obtaining 1,8-diaminonaphthalene, wherein the purity of 1,8-diaminonaphthalene at the top of the rectifying
tower is equal to or larger than 99.5%. The dinitronaphthalene raw materials comprise water and an
organic solvent, wherein the
organic solvent comprises an
organic solvent used by a naphthaline-nitrified product in refining.