The invention discloses a method and a system for detecting the performance of an oscillatory wave partial discharge measuring instrument for cable of 35kV and below. The method comprises the steps of: setting experiment parameters and selecting experiment circuit according to a control instruction sent by the master control unit; detecting the performance corresponding to the oscillatory wave partial discharge measuring instrument according to the set experiment parameters and the selected experiment circuit; the measuring loop obtaining a response signal of the performance detection corresponding to the oscillatory wave partial discharge measuring instrument and sending the response signal to the master control unit; and the master control unit analyzing and processing the response signal to obtain the performance detection data corresponding to the oscillatory wave partial discharge measuring instrument. According to the invention, the method and the system can be used for network entry detection, pattern test and arrival detection of oscillatory wave partial discharge measuring instrument; the performance detection work of the oscillatory wave partial discharge measuring instrument can be regulated and automatic and standardized detection of key items can be completed under computer control, thereby reducing the influence of uncertain factors such as personnel, equipment and the like in the detection process and improving the detection efficiency and accuracy.