In order to study the fracture evolution law of coal containing gas under triaxial compression, the industrial CT scanning test of loaded coal containing gas under triaxial loading was carried out by using the Industrial micro-CT scanning system for loaded coal containing gas. The CT images and stress-strain curves of coal samples at each deformation stages were obtained. The 3D digital reconstruction of CT scanning data was carried out by using image analysis software, and the 3D visualization and quantitative characterization of internal fractures of coal samples were realized. Based on the gray level co-occurrence matrix (GLCM) theory, the fracture dynamic expansion characteristics and laws of loaded coal containing gas were analyzed. The results show that: the existence of gas pressure weakens the mechanical properties of loaded coal containing gas to a certain extent, but also accelerates the expansion of cracks. The two-dimensional fractures of the loaded coal containing gas first close and then expand, and then expand rapidly after the peak, forming a connected two-dimensional fracture network. The three-dimensional fracture volume and fracture density show a trend of first decreasing and then increasing, which can be divided into three stages: fracture compaction and closure, new fracture initiation and expansion, and main fracture accelerated expansion and penetration. In the gray level co-occurrence matrix analysis, the contrast first decreases and then increases, the energy and homogeneity first increases and then decreases, and the correlation presents a monotonic decreasing trend, which accurately describes the overall development law of the internal cracks of loaded coal containing gas changing with the increase of stress.