The invention relates to the field of power cables, in particular to a power cable wire stripping device. The power cable wire stripping device comprises a supporting base, a sliding bearing plate, a cutting knife, a sliding component and a wire stripping main body, wherein the supporting base is a rectangular frame, and consists of a fixing base, two side supporting frames and an upper cross frame; the sliding bearing plate is mounted on the fixing base through a first sliding rail; the cutting knife is mounted at the middle part of the sliding bearing plate, and consists of an upper occluding knife blade and a lower occluding knife blade; the sliding component is mounted on the upper cross frame through a second sliding rail; the wire stripping main body is fixedly mounted on the sliding component, and comprises three parts from the front side to the back side, sequentially a front fixing and clamping end, a middle wire stripping end and a back fixing and clamping end; annular grooves are formed in the right side end surface of the front fixing and clamping end and the left side end surface of the back fixing and clamping end; the middle wire stripping end is mounted between the front fixing and clamping end and the back fixing and clamping end through the annular grooves.