The invention relates to the technical field of power grid power supply detection and particularly relates to a method for determining a power transformer bushing tap partial discharge high-frequencypulse current signal source. The method comprises the following steps: acquiring a standard high-frequency pulse current signal according to a calibration pulse signal; calculating the equivalent timeand the equivalent frequency of the standard high-frequency pulse current signal; determining the standard time and the standard frequency according to the equivalent time and the equivalent frequency of the standard high-frequency pulse current signal; according to the standard time and the standard frequency, determining a source of the bushing tap partial discharge high-frequency pulse currentsignal when a power transformer works normally. The method is advantaged in that an important basis is provided for partial discharge high-frequency pulse current detection.