In this paper, the cooperative positioning error of a high-precision airborne infrared detection system for aerial point targets is studied. The principle of cooperative positioning error is analyzed, the influencing factors of error are sorted out, and the error model is established. The influence of the Time-Space-Base error and the Base-Transfer error to cooperative detection error is analyzed. The analysis results are verified through simulation. Based on the results of simulation analysis, suggestions are given on the methods to improve the cooperative detection accuracy.