The invention discloses a preparation process of zanthoxylum armatum marinating oil, and particularly relates to the field of zanthoxylum armatum marinating oil and a processing process thereof. The preparation process comprises the following steps of S1, firstly adding rapeseed oil into an oil pot, performing heating to 120-125 DEG C, then sequentially adding fresh ginger, garlic, onions, green Chinese onions, glutinous-rice-cake-like peppers, Pixian bean paste, spices, dried zanthoxylum armatum and seasoning, performing mixing, and performing deep-frying; and S2, filtering out raw material residues in the oil pan, cooling to 10-45 DEG C after filtering and removing the residues, finally adding zanthoxylum armatum oil for seasoning and mixing, and performing packaging and warehousing. Rapeseed oil, fresh ginger, garlic, onions, green Chinese onions, glutinous-rice-cake-like peppers, Pixian bean paste, spices, dried zanthoxylum armatum, seasonings and zanthoxylum armatum oil are used as raw materials. The prepared marinating oil is spicy, hot and unique in flavor, the marinating oil can adsorb grease, taste and the like contained in marinated products, and the taste becomes thickerand thicker, so that the marinating oil can perform marination for multiple times, zanthoxylum armatum oil can be directly added when people want to make the food more pungent and spicy, and the marinating oil is very convenient to use.