The invention discloses a combined process method for producing an ultra-low-sulfur diesel. The combined process method for producing the ultra-low-sulfur diesel is characterized by comprising the following steps of mixing inferior high nitrogen diesel raw materials, partially circulated hydrofining diesel oil products and hydrogen; heating through a heating furnace; entering into a liquid phase hydrogenation reactor; carrying out olefin hydrogenation saturation, desulfuration, denitrification and aromatic saturation; discharging a reaction by-product gas out of a reaction system; partially circulating the hydrofining diesel oil products; entering into a catalyzed adsorption desulfurization reactor after mixing the other parts with the hydrogen; removing residual sulfide, and obtaining the ultra-low-sulfur clean diesel.The combined process method provided by the invention combines liquid-phase circulation hydrogenation and catalyzed adsorption desulfurization, removes a sulfur compound in the diesel step by step, not only solves the difficult problems that the diesel liquid-phase circulation hydrogenation reaction condition is strict and the product sulphur content is difficult to meet the national V/VI standard, but also avoids the defects of short catalyzed adsorption desulfurization operation period and frequent use of loading and unloading agent, and has the advantages of low operation pressure, small hydrogen consumption, small investment and the like.