The invention discloses a multisource heterogeneous power distribution network fault simulation method based on RTDS. The method comprises the following steps: step one, simulating a multisource heterogeneous power distribution network line flow on a RTDS platform according to the actual line topology of the multisource heterogeneous power distribution network, namely, establishing a multisource heterogeneous power distribution network model; step two, realizing transformer substation protection logic on the RTDS platform; step three, realizing the fault control logic on the RTDS platform,; step four, realizing the interaction of the multisource heterogeneous power distribution network model and a distributed FA. The simulation platform construction based on the RTDS replaces the traditional verification mode, the real power distribution network topology, line flow, operation mode, and various fault types can be simulated as far as possible; compared with the traditional fault simulation method, the method disclosed by the invention has better convenience, flexibility and comprehensiveness, and the research and development and the engineering implementation procedure of the distributed FA strategy are greatly accelerated.