The invention relates to a flexible fault simulator system for a distribution network moving mould experiment platform. The system comprises an upper computer, a main control processing module, a voltage zero-crossing compare module, a voltage mutual inductance module, a drive module, a bidirectional silicon controlled rectifier switch module, a contactor module and a power supply module. The main control processing module is connected to the upper computer by an Ethernet network and is also connected with the voltage zero-crossing compare module and the drive module respectively; the voltage zero-crossing compare module is connected to a tail end of a primary side bus by the voltage mutual inductance module; the drive module is connected with the contactor module and the bidirectional silicon controlled rectifier switch module; and the bidirectional silicon controlled rectifier switch module is connected to the tail end of the primary side bus in series; and the power supply module is connected with the main control processing module, the voltage zero-crossing compare module, and the drive module. According to the system, the transient waveform of the fault simulator is effectively improved and precise control of the fault phase angle is realized.