The utility model relates to a partial discharge measuring system, which comprises a partial discharge detector, an ultrahigh frequency sensor, a voltage phase measuring instrument, a first digital oscilloscope and a second digital oscilloscope, wherein the first digital oscilloscope is in circuit connection with the ultrahigh frequency sensor, and the second digital oscilloscope is in circuit connection with the partial discharge detector, the ultrahigh frequency sensor, the first digital oscilloscope and the voltage phase measuring instrument. The partial discharge measuring system provided by the utility model can realize detection and positioning for partial discharge, is high in anti-interference capacity and high in sensitivity. The non-contact measuring mode is safer for secondary equipment and personnel, the structure of the system is simple, and the system is especially suitable for online monitoring, thereby having obvious advantages compared with other methods.