Reinforcing fitting string applied to ground wire of power transmission line

The invention discloses a reinforcing fitting string applied to a ground wire of a power transmission line. The reinforcing fitting string comprises a middle-layer twisted wire wound outside the ground wire, an outer-layer twisted wire wound on the middle-layer twisted wire and a connecting assembly used for connecting the middle-layer twisted wire and the outer-layer twisted wire with a tension-resistant iron tower. An inner-layer twisted wire wound on the ground wire is arranged between the middle-layer twisted wire and the ground wire, and the middle-layer twisted wire is wound on the inner-layer twisted wire. By winding the inner-layer twisted wire, the middle-layer twisted wire and the outer-layer twisted wire on the ground wire, the tension of the ground wire is symmetrically transferred to the two groups of connecting assemblies and applied to a strain tower, so that a strain clamp which is originally used for bearing the tension of the ground wire does not bear the tension anymore, and the connection