The invention relates to the technical field of electrical equipment tools, in particular to a grading ring installable at a wire end of an electric transmission line linear tower under electricity. The grading ring comprises a hollow aluminum pipe arc ring body with an opening preformed right in the front, wherein the hollow aluminum pipe arc ring body is connected with a bottom installation assembly in welding mode through an aluminum support, the bottom installation assembly comprises an open U-shaped fixture, a clamp spring press plate is arranged at an inner corner of the fixture, a touch press plate with a sprig is arranged on the open portion of the fixture and on the opposite side of the clamp spring press plate, and a free end of the touch press plate is pressed against a free end of the clamp spring press plate, and seals the fixture. The grading ring can change work which can be completed only in power failure into electrical operation when effectively used, improves timeliness of defect treatment, improves power supply quantity and reliability due to the fact that the grading ring can convert the work which can be completed only in the power failure into the electrical operation, and reduces physical exhaustion of workers by preventing the workers from climbing out of a wire for installation due to the electrical operation.