The utility model discloses an extensible closed-loop synchronous power distribution automation terminal detecting platform. The extensible closed-loop synchronous power distribution automation terminal detecting platform is characterized by comprising a power module, a communication module, a synchronous clock, a signal source, a switching value detecting module and standardization detecting interface sets, wherein the communication module, the synchronous clock, the signal source, the switching value detecting module and the standardization detecting interface set are connected with the power module. The communication module is connected with the signal source and the switching value detecting module. The signal source and the switching value detecting module are each connected with the corresponding standardization detecting interface set. The signal source, the switching value detecting module and standardization detecting interfaces are all extensible. Connection with tested terminals is achieved through the standardization detecting interface sets. According to the extensible closed-loop synchronous power distribution automation terminal detecting platform, closed-loop synchronous detection of multiple intelligent power distribution terminals can be achieved, the detection efficiency is improved, and a standard detecting platform is provided for the power distribution automation terminals of different manufacturers and different types.