To address the shortcomings of existing threat assessment methods for UAV swarms， this paper proposed an unmanned aerial vehicle UAV swarm threat assessment method based on an improved preference ranking organization method for enrichment evaluations PROMETHEE. First， a threat assessment index system for UAV swarms was constructed， and membership functions were established for quantification. Then， to overcome the limitations of the traditional PROMETHEE method， a new preference function was designed to improve the PROMETHEE approach， thereby establishing a UAV swarm threat assessment model based on the improved PROMETHEE. Finally， simulation experiments were conducted to validate the effectiveness of the proposed method.