To improve the processing efficiency of plasma spectra during laser welding/additive manufacturing processes, a professional software for automatically calculating characteristic parameters was developed, and a fitting goodness algorithm was used to quantify the matching degree between measured spectral data and fitted data. The accuracy and efficiency of the software calculation were verified based on the spectral data of AA6061 fiber laser-arc hybrid welding. The results show that the software can not only automatically select characteristic spectral lines and calculate characteristic parameters such as electron temperature and electron density in batches, but also provide accurate calculation results, with a maximum average deviation from the standard results of only 3.4%. Particularly noteworthy is the efficiency improvement in processing spectral data by over two orders of magnitude. Therefore, it can provide an efficient and accurate tool for processing plasma spectral information and is expected to offer a new approach for laser processing manufacturing and process monitoring.