Taking Maodi Coal Mine in Shanxi as an example, the weight calculation was carried out based on Analytical Hierarchy Process (AHP), and the fuzzy comprehensive evaluation method was improved. The validity, quantization vector and confidence criterion were introduced to modify the evaluation results of traditional geo environmental assessment methods. The results show that the evaluation result of traditional fuzzy comprehensive evaluation model is grade I (general) with a validity of 0.121 89. When k0 of the improved fuzzy comprehensive evaluation model is 2 and the membership degree is 0.775 4 (confidence>0.65), the mine geological environment quality is revised to grade II (more serious). The analysis shows that the improved fuzzy comprehensive evaluation method is more suitable for mine geological environment quality evaluation.