Non-contact measuring method and measuring device for outer diameter of cable

The invention discloses a non-contact measurement method for the outer diameter of a cable, and the method comprises the following steps: taking a measurement camera and a laser range finder as a group of measurement systems, and enabling a plurality of groups of measurement systems to be annularly distributed at the periphery of the measured cable; each measuring system moves to be coaxial with the measured cable; the laser range finders of the measuring systems respectively measure the spacing distances between the laser range finders and the measured cable, and calculate the theoretical diameter of the measured cable according to the measured spacing distances; the measurement height of each measurement camera is adjusted according to the theoretical diameter of the cable, so that the measurement cameras are in a focusing state after being moved; measuring the chord value of the measured cable by the measuring camera, and calculating the outer diameter of the cable based on the measured chord value; and av