The invention discloses a recycling method of a hydrotreating catalyst. The recycling method comprises the following steps that (1) molybdenum and nickel waste catalysts are subjected to extraction, roasting and smashing; (2) the smashed catalyst powder is mixed with alkali and then subjected to microwave treatment; (3) an acid solution is added into a molybdate solution in step (2), and molybdicacid is obtained; (4) aluminum oxide filter residue in step (2) is smashed and mixed with alkali again and roasted, and an aluminate solution and a nickel oxide solid are obtained after hot water dipping and filtering are conducted; (5) carbon dioxide is introduced into the aluminate solution in step (4), pseudo-boehmite is prepared by utilizing a carbonization method, and pseudo-boehmite is mixedwith an adhesive to be moulded, dried and roasted to prepare a carrier; (6) acid is added into the nickel oxide in step (4) to prepare a nickel solution, carbonate is added into the nickel solution to prepare alkaline nickel carbonate; and (7) the molybdic acid in step (3) and the alkaline nickel carbonate step (6) are mixed to prepare a Mo-Ni-P-O solution, the carrier in step (5) is dipped withthe Mo-Ni-P-O solution, and the catalyst is prepared after dying and roasting are conducted on the carrier. The method is particularly suitable for preparing new catalysts by using molybdenum and nickel waste catalysts, and has the characteristics that the technology is simple and the treatment cost is low.