Aiming at the problem of battlefield emergency repair capability evaluation of repair unit under the condition of simulation operation, a fuzzy comprehensive evaluation method based on cloud model for site selection capability of battlefield maintenance shop (BMS) is proposed. Taking the BMS site selection ability in the preparation stage of emergency repair as the evaluation object, based on the traditional fuzzy comprehensive evaluation method, considering the uncertainty brought by the subjective evaluation of qualitative indicators in the evaluation process, the cloud model theory is introduced for improvement, and the comprehensive evaluation cloud model and the comment cloud model are compared through Matlab simulation. The results show that the improved method fully reflects the fuzziness and randomness, reduces various uncertain factors, and realizes the relatively accurate conversion of qualitative and quantitative indicators.