The invention relates to the field of electric power measurement, in particular to a power cable bending radius measuring scale. The power cable bending radius measuring scale solves the technical problem that a device for measuring the power cable bending radius rapidly on the spot lacks at the present. The power cable bending radius measuring scale comprises a chord rod, a sliding way perpendicular to the chord rod is fixedly arranged right in the center of the chord rod, and the two ends of the chord rod are provided with rod legs which are perpendicular to the chord rod and are of equal lengths; a sliding scale is arranged in the sliding way; a jackscrew for limiting the sliding scale is arranged on the one side of the sliding way. The power cable bending radius measuring scale has the advantages that the power cable bending radius can be accurately calculated, and the measuring scale is simple in structure and convenient to use; the measuring scale can further be used to measure the radius of other objects of similar structures to the cable.