<p>The direct cause of many geological disasters is the extension of damage zones. It is widely accepted that identifying, evolving, and evaluating damage zones is crucial during the rock fracture process. Many true triaxial and synchronous acoustic emission (AE) experiments have been performed on rock specimens. The AE spatial-accumulated energy release coefficient (AE SAERC) was established to describe the cumulative damage level of the rock. Using the three-dimensional (3D) kriging interpolation method, a 3D visualization method for rock damage was proposed. Furthermore, a method for evaluating the internal damage grade of rock was proposed. A rock damage classification scheme was established based on the AE SAERC. The evolution of rock damage areas was quantified, and the results indicate that the 3D visualization image established using ordinary kriging (Gaussian model) theory coincides with the actual damage. As the stress increases, the low-damage zone (LDZ), moderate-damage zone (MDZ), and high-damage zone (HDZ) gradually transform. The gradual expansion of these damaged areas gradually induces the deterioration of the rock. This method provides a clearer 3D spatial distribution and evolution paths of rock damage areas, which is a meaningful discovery for evaluating the internal damage of rocks.</p>