The invention provides a cable processing method based on three-dimensional digitalization design. The cable processing method comprises the following steps that 1, a single three-dimensional cable bundle model is flattened in a plane, the position of the three-dimensional cable bundle model is kept fixed, and the three-dimensional cable bundle model is flattened in the mode that branches of each cable of a cable bundle of different electrical connectors are arranged on the two sides of a main beam of the cable; 2, a cutting-line table is generated; 3, a pinboard image template is determined and packaged, so that a pinboard image is generated; 4, based on the pinboard image, the branches of each cable in the cable bundle of the pinboard image are bound into a T shape or a Y shape, branches of the cables perpendicular to the horizontal plane are expressed with the mark 'perpendicular to the horizontal plane', branch locating points and hole points of the cables are marked, and the positions of pins 1 of the electrical connectors are marked; 5, according to the cutting-line table and the pinboard image, cable feeding, processing and manufacturing are conducted. By the adoption of the cable processing method, the development period of products can be easily shortened, repeated correction in design is reduced, and cost is reduced.