In order to meet the operator’s requirements of simulation training for the tethered multi-rotor UAV and its mission load, a tethered multi-rotor UAV simulation training system is designed and implemented. The system consists of a flight simulation computer system, a portable control terminal simulator and an instructor console. We propose a tethered multi-rotor UAV based on a rope and a simulation model of its aerodynamics, flight scene, scenario battlefield environment and scene objectives. The realization of the system is described from the aspects of system architecture optimization, the protocol of communication link, and replacement of real equipment. The results show that the system has complete structure, good security, simplified configuration, flexibility, convenience, low cost, and is suitable for field training.