The invention discloses a method for stripping metal and nonmetal in a waste cable, belonging to the solid waste treatment and resource recycle field. In the method for stripping metal and nonmetal in the waste cable, sheared cable particles are put in a groove ultrasonic wave device with medium. The temperature range of water medium in the ultrasonic wave device is less than 100 DEG C, the working frequency of the ultrasonic wave is 9-40kHz, the sound energy density is 0.4W/cm<2>-0.8W/cm<2>, and the treatment time of the ultrasonic wave is 10s-10min. the method reduces losses of metal resources and ensures the complete stripping of the metal and the nonmetal in the cable. And the metal products are provided with high quality. Good conditions are provided for the categorized complete separation of various resources. The stripping efficiency of the metal and the nonmetal in the waste cable can be larger than 85 percent.