1. A real time dynamic physics simulation device of flexible DC transmission system is characterized that, it includes simulated converter transformer, simulated AC field, simulated DC field, simulated converter reactor, simulated converter, and measurement and control cabinet chassis; said simulated AC field includes the vacuum switch I, the contactor I, resistors and the vacuum switch II, and they are connected orderly; said simulated DC field includes successively connected the vacuum switch contactor III and II; said simulated AC field is connected with said measurement and control cabinet chassis; said converter transformer is set between said resistors and said vacuum switch II; and said simulated converter reactors and said simulated converter are connected that is set between the vacuum switch II and the vacuum switch III.