The invention provides a flight control simulation system with fault diagnosis capability for an unmanned helicopter. The flight control simulation system with fault diagnosis capability for an unmanned helicopter comprises a simulation general control console, a simulation computer, a flight control management system, a sensor system, physical effect equipment, a servo system, a remote control and remote measurement system, and a task load system, wherein the simulation general control console controls the simulation computer to carry on a power on test, model generation and injection of fault model; the simulation computer selects simulation and interference model and simulates fault injection to carry on flight simulation; the flight control management system receives the information of sensors and the remote control and remote measurement system; the servo system realizes the real reaction of an operating mechanism; and the sensor system transmits the acquired sensor information to the flight control management system. For the flight control simulation system with fault diagnosis capability for an unmanned helicopter, the simulation computer can be embedded into different aircraft mathematical models, so that simulation of a plurality of aircrafts can be realized. For the flight control simulation system with fault diagnosis capability for an unmanned helicopter, the servo system and the sensor system can access a real steering engine of aircraft and real sensors so as to develop the steering engine of aircraft, to make a test flight for the steering engine of aircraft, and detecting working of the sensors.