The invention discloses a device for removing insulation layer of a power cable, which comprises a handle, a support frame, a chuck, a wire cutting ring and a motor, the handle includes a first handle and a second handle, and the end of the first handle There is a first lever at the end, and a second lever is arranged at the end of the second lever, and the first lever and the second lever are cross-connected by a rotating shaft, and the first lever and the second lever are connected The outer side is covered with a support frame connected to the rotating shaft. The chuck includes an upper clamping block and a lower clamping block. The upper clamping block is connected with the second driving rod, the lower clamping block is connected with the first driving rod, and the upper clamping block A tangent ring is provided between the clamping block and the lower clamping block, and the tangent ring is connected to the support frame through a support rod, and a motor for driving the tangent ring to rotate is fixed on the support rod. The cable is fixed by the upper and lower clamping blocks, and the insulation layer of the cable can be automatically cut circularly by using the tangent ring, which solves the problems of cumbersome manual cutting and peeling operations, easy damage to the cable, and time-consuming and labor-intensive problems.