The utility model provides an annular cutting device for large-section wires. The annular cutting device is used for cutting wires in an overhead transmission line. The device comprises a coaxial annular gripping mechanism and a cutting mechanism, and an annular connecting block is arranged between the gripping mechanism and the cutting mechanism. The device is characterized in that the gripping mechanism comprises an internal ring and an external ring; an annular frame is arranged on one side of the internal ring and internally provided with fixed terminals; the cutting mechanism comprises a movable support and a fixed support which are arranged along the diameter of the cutting mechanism; the movable support is provided with a chuck; a grinding wheel fixing shaft is arranged at a circle center of the fixed support; and the chuck is tangent with the grinding wheel fixing shaft. Compared with the prior art, the annular cutting device for the large-section wires can be used for gripping the large-section wires stably and effectively and cutting the large-section wires, is simple in structure and convenient to operate, greatly reduces the labor intensity, shortens the working time and improves the working efficiency.