The invention relates to a reshaping clamp of single-phase rectangular open coiled iron core windings, which is used for reshaping a rectangular winding and also can be used as a bed frame for assembly and combination of open coiled iron plug-in windings. The reshaping clamp comprises a radial winding reshaping clamp, an axial winding reshaping clamp and a chocks in windings; wherein the radial winding reshaping clamp is clamped on the radial position between phases of a pair of single-phase variable windings, the axial winding clamp is clamped on the axial position of the two windings; a positioning reference plane is arranged on the radial winding reshaping clamp; an insulation baffle plates between phases of the two windings is placed and positioned before the windings are clamped in pairs; and axial chocks (for controlling the clamping heights of the windings) and radial chocks (for controlling radial width between phases of the windings) are arranged in the inner cavities of the two windings. The reshaping clamp has low reshaping clamp cost, simple structure, convenient procedure and strong practicability, and plays the functions of low cost and high efficiency in production of transformers in small batches.