A process for regenerating the aminating catalyst which is composed of carrier (alumina) and two or more of Ni, Cu, Cr, Ti and Re or their oxides features that the deactivated catalyst can be calcined and/or washed and/or immersed in liquid to recover its activity. The regenerated catalyst can be used to prepare morpholine compound with diglycol as raw material or the high-boiling-point substanceas by-product during preparing morpholine as raw material.