The present invention provides a process for fabricating high-purity ruthenium separated material by crystallization with excellent filterability and low moisture percentage. In the working procedure of adding ammonium chloride into hydrochloric acid solution of ruthenium to prepare ammonium hexachlororuthenate, the hydrochloric acid solution of ruthenium is kept at 80-95 DEG C for more than 3 h,ammonium chloride is added therein, then the solution is kept at 85-95 DEG C for more than 1 h to get precipitation of ammonium ruthenium hydrochloride, and then the moisture level is reduced to lower than 20 wt% after filtration.