The utility model discloses a device for detecting partial discharging by ultrahigh frequency band signals. The device comprises a frequency spectrum detection unit and a time solution unit, wherein the frequency spectrum detection unit is used for searching partial discharging activity by scanning a radio frequency signal and comprises a central processing module, and the time solution unit is used for determining a given frequency after detecting the radio frequency signal probably generated by the partial discharging activity, and displaying a probable partial discharging signal in a period of time, the probable partial discharging signal is relevant to power and has a time reference, and the time solution unit comprises the central processing module; the central processing module of the time solution unit is connected with an analog/digital (A/D) conversion module; the A/D conversion module is connected with a pre-amplification module; and the pre-amplification module is connected with a sensing and receiving module. The device for detecting partial discharging by ultrahigh frequency band signals has the advantages that the device can detect partial discharging within several seconds without stopping or special connection, is provided with a super-large display screen and a keyboard button and is light, durable and high in performance.