The path optimization technology of the threeaxis digital engraving machine array processing plate was studied, the traditional processing flows and defects were described. The purpose of path optimization was to automatically generate better quality paths than manual experience paths. Based on the three models of a typical loudspeaker box and corresponding NC files were established, reading NC files and analyzing the path was realized by using the software. By analyzing the time consumption ratio of the path blank line, feeding, machining, and repeated path in the NC file, the overall quality of the path was evaluated. Based on the evaluation, the NC file was postprocessed based on a feasible solution as the starting point. A better path was found through the optimization method, and a new path was output according to the rules of the processing method. The optimized path is in line with the traditional production mode, and it can be easily upgrading. According to the test results, the optimized path has been improved in terms of processing efficiency.