The reconnaissance and tracking to a target can be realized through the airborne stabilized platform for loitering munitions. The tests for platform stability, target tracking and servo control performance are all very important, but flight experiment is extremely difficult. By using the idea of Hardware-in-the-Loop (HIL) simulation, an HIL system was designed and manufactured for simulation test in the laboratory. The system composition, working principle and key technologies are presented in the paper. Results of experiment indicate that the system meets the design requirements and reaches a certain accuracy. It can provide a new idea for algorithm research.