Mobile platform cooperative detection radar system is a network composed of multiple radar nodes，which can significantly improve the target detection and anti-complex jamming ability.It is a hot research topic at present，but how to quantitatively evaluate its anti-jamming ability is a difficult issue.A method for evaluating the anti-jamming performance of mobile platform cooperative detection radar system is proposed.By analyzing the anti-jamming performance in different application scenarios，the anti-jamming capability enhancement degree is defined to quantitatively evaluate the anti-jamming performance of a single radar and the whole system.The evaluation steps include determining the reference scene，determining the scene to be evaluated，calculating the signal-to-jamming ratio and the improvement of anti-jamming performance，and verifying the effectiveness of this method through an example calculation.The proposed method provides an idea and a way for quantitatively evaluating the anti-jamming capability of the cooperative detection radar system of mobile platform.