Process for controlling printing color difference

The invention discloses a process for controlling printing color difference. The process comprises the following steps that S1, color separation is conducted according to a product printing sequence;S2, one color block is made at the lower left corner of a color separation image text according to the color register, an independent color is a separate color block, and if the color needs to be overlaid to be a visible color, the plurality of overlaid colors need independent color blocks to be overlaid; S3, color blocks are cut to be subjected to color matching, the cut color blocks can be identified and reserved, and traceability is formed; and S4, process control is carried out on each color block, and color difference of the printing color register is avoided. According to the process, the color of ink in a printing stage can be controlled, the bad batch color difference is avoided, the color of the color register is effectively controlled, the guarantee is provided for the consistency of the colors of all batches, the moving rate of equipment is reduced, the yield of products is improved, the usage amount of the ink is reduced, and environmental protection is facilitated.