Complex mountainous terrains pose significant challenges to the operational effectiveness of UAVs in collaborative reconnaissance and strike missions against ground tactical targets, necessitating the establishment of a scientifically sound and adaptive evaluation system. Based on a subjective-objective combined weighting strategy integrating the analytic hierarchy process (AHP) and entropy weight method (EWM), a comprehensive evaluation index system was constructed, encompassing six dimensions: information acquisition, target recognition, command decision-making, strike effectiveness, collaboration efficiency, and mountain adaptability. Weighting results reveal that strike effectiveness (36.33%) and mountain adaptability (24.75%) dominate overall operational effectiveness. At the core indicator level, terrain-corrected circular error probable (CEP) with a weight of 27.98% leads the strike effectiveness dimension, while the terrain-matched flight index at 29.70% ranks first in the mountain adaptability dimension. This framework provides an actionable theoretical basis and practical guidance for quantitative evaluation of UAV collaborative reconnaissance-strike effectiveness in complex mountainous environments, identification of system weaknesses, optimization of resource allocation, and tactical decision-making.