Abstract: To reveal the damage evolution, instability failure, and formation mechanism of rockburst pits in roadway surrounding rock subjected to fatigue disturbance under deep high in-situ stress conditions, granite surrounding rock from a deep mine was selected as the research object. Cubic specimens containing a semi-excavated roadway structure were prepared, and true triaxial unloading-cyclic loading tests were conducted under different burial-depth stress conditions. Combined with CT scanning and three-dimensional reconstruction techniques, the internal crack distribution and spatial morphology of rockburst pits in the failed specimens were visualized and analyzed. The results show that, during true triaxial fatigue disturbance, the stress-strain curves of the specimens exhibit obvious hysteresis characteristics. Both the axial peak strain and residual strain increase nonlinearly with increasing cycle number, showing slow growth at the initial loading stage and accelerated abrupt growth before failure, indicating that the damage evolution of the surrounding rock transforms from stable accumulation to rapid instability. With continued cyclic loading, the stiffness evolution of the specimens is jointly controlled by crack compaction, increasing stress level, and fatigue damage accumulation. The secant modulus shows staged growth in the early and middle stages but decreases significantly before failure. The peak elastic modulus and residual elastic modulus generally exhibit a decreasing trend, among which the residual elastic modulus is more sensitive to irreversible damage. The damage characterization parameter established based on the ratio of peak elastic modulus to residual elastic modulus can reflect the fatigue damage accumulation process and serve as a precursor indicator for the transition of specimens from the stable damage stage to the accelerated instability stage. Macroscopic failure observations and CT reconstruction results show that cracks and rockburst pits are mainly concentrated near the roadway unloading surface, hole wall, and excavation face, and further extend toward the lateral, upper, and deep retained rock masses, forming a localized failure zone characterized by the combined effects of tensile cracking and shear failure. Based on the correlation analysis among deformation response, stiffness degradation, and CT-based three-dimensional damage morphology, the continuous evolution process of roadway surrounding rock under true triaxial fatigue disturbance is revealed, involving residual deformation accumulation, residual stiffness weakening, local crack coalescence, and rockburst pit formation. The research results provide an experimental basis for fatigue damage identification, rockburst pit formation mechanism analysis, and rockburst disaster prevention and control in deep roadway surrounding rock.