To address the efficiency evaluation of organizational management in unmanned construction of drilland-blast tunnels, an evaluation system based on the super-efficiency Slack-Based Measure (SBM) model with undesirable outputs was constructed. Taking a tunnel under construction in the Xizang Autonomous Region as a case study, an evaluation index system comprising four input indicators and four output indicators was established, wherein the overbreak volume was treated as an undesirable output. The evaluation of 30 construction cycles revealed that the average efficiency value was 0.988, with 66.67% of the cycles being DEA-efficient. The sub-process scheduling time and advance distance per cycle were identified as the most critical factors influencing the organizational efficiency. Furthermore, construction cycles at different efficiency levels exhibited significant sensitivity stratification characteristics, indicating the presence of a diminishing marginal effect in efficiency improvement.