Cable bending radius measuring tool

The invention discloses a cable bending radius measuring tool, and relates to the technical field of cable pay-off equipment. Currently, cable bending radius measurement is troublesome. The sliding part is installed on one side of the base plate, the second clamping plate included in the sliding part and the first clamping plate arranged at the end of the base plate clamp the two sides of the cable to measure the diameter, and the sliding distance of the sliding part is the diameter of the cable; the other side of the substrate is provided with a measuring part, the measuring part slidably extends towards one end of the substrate, and meanwhile, a measuring plate included in the measuring part rotates by taking the extending end of the measuring part as a circle center; the substrate is also provided with a reverse displacement amplification mechanism which is used for controlling the equal-proportion reverse displacement of the measuring part and the sliding part. When the measuring tool is installed, the ex