An improved multi-tasking collaboration model based on dynamic coalition was proposed for UAV combat network.According to the UAV networks connectivity and task priorities,a collaboration message forwarding mechanism was established in the model.As the scales of UAV dynamic coalitions were controlled at a reasonable level,the UAV networks could work more efficiently.According to the theory of discrete event system simulation,a UAV network simulation model based on priority queues was established using the time stepping technique,which was used to simulate UAV multitasking collaboration process.Simulation results show that,compared with non-collaborative strategy and the original dynamic coalition model,the proposed model can work effectively with reduced task processing time and improved multitasking operation efficiency.