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 a vacuum switch I, a contactor I, resistors and a vacuum switch II, and they are serially connected; said simulated DC field includes serially 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 between said resistors and said vacuum switch II; and said simulated converter reactors and said simulated converter are connected that is between the vacuum switch II and the vacuum switch III.