Benefit evaluation of geological environment restoration aims to serve the prediction of the benefits of geological environment governance in abandoned mines and the assessment of the effectiveness of restoration, providing reliable decision-making support and effective supervision methods for restoration engineering practices. Through the review of domestic and foreign literatures and the cluster analysis of relevant influencing indicators, combined with the triple bottom line theory and sustainable development theory, a benefit evaluation index system for the geological environment restoration of abandoned mines was constructed from four dimensions, including economy, society, ecology, and sustainable development. The analytic hierarchy process (AHP) and entropy method were used in combination to assign weights to the indicators, and the fuzzy comprehensive evaluation method was used to construct the restoration evaluation model. The model was empirically applied in the geological environment restoration project of historical abandoned mines in Zhangjiakou city. The results show that the evaluation result benefit of geological environment restoration of abandoned mines in the city is 89.85, and the restoration effectiveness level is good. The ecological and social benefit evaluation values are relatively high, indicating that the case project has generally achieved the restoration goals of eliminating hazards, improving the ecology, and enhancing functions. The sustainable development and economic benefit evaluation values are relatively low, and measures still need to be optimized from aspects such as improving maintenance systems and mechanisms, strengthening publicity and education, and implementing dynamic monitoring and supervision to further improve the comprehensive benefits of restoration. The proposed evaluation index system and model are scientific and feasible, and can effectively evaluate the benefits of geological environment restoration in abandoned mines, providing a reference for the benefit evaluation of similar projects.