The invention discloses a surgical device for treating the cataract. The surgical device comprises an emulsification instrument body, an incision blade, an ultra-emulsification probe and an artificial lens containing part. A suction pouring system is arranged at the front end of the ultra-emulsification probe. The surgical device further comprises an electric rotating base connected to the front end of an electric telescopic rod, the incision blade, the ultra-emulsification probe and the artificial lens containing part are connected to the side of the electric rotating base, and five control keys for controlling the incision blade, the ultra-emulsification probe, the artificial lens containing part, the electric telescopic rod and the electric rotating base are arranged on one side of the emulsification instrument body. The surgical device further comprises an amplifying type electronic monitoring device. The monitoring amplifying device and the structure capable of achieving precision displacement and rotation are used for a cataract ultrasonic emulsification instrument, all contents in surgery can be precisely operated based on amplifying monitoring, the success rate of the cataract surgery can be greatly increased, and the working intensity of doctors can be greatly relieved.