The invention discloses a verification method for high-frequency partial discharge live detection of a high-voltage cable accessory. The method comprises the following steps: clamping a high frequency current transformer (HFCT) on a metal sleeve outgoing line of an insulating joint; arranging external coupling capacitors Cc on both sides of a joint insulating flange; injecting a verification pulse IPG through the Cc by adopting a standard pulse generator; detecting Id transmitted to the outgoing line of the IPG by adopting the HFCT; selecting a frequency band FD3 on which the signal to noise ratio of the HFCT is highest; injecting five IPGs with different quantities of electric charge Qcal in sequence; calculating the equivalent discharge Qd of the Id in the FD3; calculating the equivalent coefficient kmi of the Qcal and the Qd; performing linear regression on the kmi to obtain a verification coefficient Fcal; correcting QHFCT detected by the HFCT with the Fcal to obtain QCAL. By adopting the verification method, the defect of the lack of a verification method in the high-frequency partial discharge live detection is overcome, and the standardization of a detection magnitude and the implementation of data transverse comparison are facilitated.