The invention provides toughened nylon 66 for a hair dryer shell and a preparation method thereof. The toughened nylon 66 comprises the following materials in part by weight: 60 to 85 parts of nylon 66 chips, 1 to 10 parts of maleic anhydride grafted ethylene-butyl acrylate copolymer, 4 to 30 parts of ethylene elastomer, 0.1 to 1 part of antioxidant and 0.1 to 1 part of lubricating agent. The method comprises the following steps of: drying the nylon 66 chips; adding the nylon 66 chips, a toughening agent, the antioxidant and the lubricating agent into a high-speed mixer in part by weight, mixing the mixture uniformly, adding the mixture into a double-screw extruder through a weightlessness weigh to perform fusion, and extruding, granulating, cooling and drying the mixture to obtain the toughened nylon 66 for the hair dryer shell. The toughened nylon 66 for the hair dryer shell has excellent impact strength and good comprehensive performance, improves the breaking resistance of the hair dryer shell, makes a hair dryer durable, and greatly prolongs the service life of the hair dryer.