The invention relates to a wire tightening clamp used for repairing wires of a power transmission circuit and a use method of the wire tightening pincers, and belongs to the technical field of power transmission circuits. The clamp comprises a handle and a U-shaped clamp. The handle is in threaded connection with the U-shaped clamp. A notch 1 and a notch 2 are arranged in the inner side of the U-shaped clamp. The use method of the clamp comprises steps of using the U-shaped clamp to clamp a to-be-repaired power transmission circuit wire; clamping a to-be-repaired single-filament aluminum wire clamp in the notch 1 or the notch 2; screwing the handle; clamping the single-filament aluminum wire with the handle; fixing the radial and axial orientations of the single-filament aluminum wire; and carrying out wire repairing work. According to the invention, during single-filament repairing work of the power transmission circuit wire, the single-filament aluminum wire can be tightly compacted with uniform compactness during repairing; the whole technology is free from gaps and kept flat; material waste is completely avoided without single filament withdrawing and rebinding phenomena; and favorable use effects are achieved.