The utility model relates to a single disk tension tool part of a driven spiral bevel gear, which comprises a pull sleeve, a pull rod, a single disk tension disk, a body, a backing board, a support sleeve and a compression spring. The pull rod is arranged on the pull sleeve. The single disk tension disk is connected with the pull rod. The body and the backing board are sleeved and connected with the pull rod. The support sleeve is arranged between the single disk tension disk and the body. The interface of the support sleeve and the single disk tension disk is in a conical fit. The compression spring is arranged between the support sleeve and the body and is in a pre-pressure state. When the single disk tension tool part of the driven spiral bevel gear, which adopts the utility model embodiment, clamps a workpiece tightly, the workpiece is stressed by the clamping force of the tension disk in the radial direction and is stressed simultaneously by the counterforce of the backing board and the axial friction force of the tension disk in the axial direction. In this way, the axial turbulence of the workpiece and the error are reduced, manufacture precision is improved and consequently product quality is improved.