The invention provides a cable partial discharge concentration point detection method and system. The cable partial discharge concentration point detection method comprises the following steps: dividing a cable to be detected into a plurality of statistical intervals; if the quantity of partial discharge points in the statistical intervals is no less than a pre-set relative threshold value of the quantity of the discharge points, counting up the quantity of the partial discharge points with the partial discharge amount, which is greater than a relative threshold value of a pre-set discharge amount, in the statistical intervals; when the quantity of the partial discharge points with the partial discharge amount, which is greater than the relative threshold value of the pre-set discharge amount, is more than an absolute threshold value of the pre-set quantity of the discharge points, judging partial discharge concentration points in the statistical intervals and acquiring that the positions of the partial discharge concentration points are gravity centers of the positions of the partial discharge points with the partial discharge amount, which is greater than the relative threshold value of the pre-set discharge amount; otherwise, judging that the statistical intervals have no partial discharge concentration points. The cable partial discharge concentration point detection method and system can be used for automatically and accurately judging and positioning the positions of the partial discharge concentration points on the cable to be detected and the accuracy problem of the detection of the partial discharge concentration points can be effectively solved.