<p>The complexity of the internal environment of a blast furnace has limited the exploration of the microscopic reaction mechanisms of metallurgical coke. Some of the traditional detection methods often focus on average value, neglecting the structural heterogeneity of coke. The changes of coke in a CO₂ atmosphere at temperatures ranging from 1000 to 1500 °C were investigated using multi-point micro-Raman spectroscopy. The results indicate that, with&#xa0;the increasing temperature, the defect-related parameters of two tested samples decreased by 63.8% and 39.2%, respectively. The interlayer spacing of graphite and the thickness of microcrystalline stacking demonstrate a linear correlation with the Raman defect index, thus offering a precise approach for monitoring the graphitization process. Surface scanning micro-Raman spectroscopy indicated that minerals experienced dynamic migration, which was characterized by an “increase–decrease–increase” pattern. Moreover, in comparison with single-point detection, the quantity of surface scanning sampling increased. Simultaneously, the variance rose from 0.097 to 0.499, which reflects the authenticity of the samples. Finally, the changes of carbon structure and inherent mineral content and distribution are visually revealed by mapping method. This method effectively provides a high-resolution microstructural scale for the quality evaluation of blast furnace coke.</p>