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Engineering construction can damage the rock mass structure, leading to a decrease in its stability. Therefore, it is necessary to detect it to ensure the safety of engineering construction. In this context, an automatic detection method for rock mass fracture and failure process based on discontinuous deformation analysis is studied. This study takes the damage of a certain tunnel project to a mountain as an example to analyze the structural characteristics of the rock mass at that location. Using ground penetrating radar technology to obtain discontinuous deformation parameters of rock fractures, construct a discontinuous numerical model of the rock mass, and insert the deformation parameters into the model. Apply loads to the model, simulate and analyze the discontinuous deformation of the rock mass, and quantify the degree of rock mass fracture and failure, including the development of cracks, displacement of the rock mass, and stability coefficient, to achieve automatic detection of the rock mass fracture and failure process. The results indicate that the cracks continue to expand along the virtual joint, ultimately dividing the entire rock mass into three blocks, with two cracks forming through cracks, causing the rock mass to fracture. The fracture process of Block 1 and Block 2 mainly occurs in the vertical direction; The fracture process of block 3 mainly occurs in the horizontal direction. The overall stability of the rock mass is gradually decreasing, from the initial basic stability to the degree of poor stability between 100 days.