The invention provides an aromatization aid and a preparation method thereof. The aromatization aid comprises, on a dry basis and on the basis of the total weight of the aid, 15 to 60 wt% of natural mineral matters, 10 to 30 wt% of an inorganic oxide binder and 20 to 80 wt% of a MFI-structure molecular sieve containing phosphorus and loading metal. When the aromatization aid provided by the invention is applied to adsorption desulfurization of hydrocarbon oil, the content of olefins in gasoline is obviously decreased, the content of aromatic hydrocarbons is increased, and the octane number ofgasoline is improved on the premise of no reduction in the desulfurization activity of a main catalyst.