The utility model discloses a distribution terminal system, and the system comprises a power connector assembly, a switcher connector assembly, a DSP connector assembly, a sampling connector assembly, a liquid crystal connector assembly, a CPU connector assembly, a digitized connector assembly, and an I/O connector assembly, wherein the sampling connector assembly, the liquid crystal connector assembly, the CPU connector assembly, the digitized connector assembly and the I/O connector assembly are respectively connected with the DSP connector assembly. The switcher connector assembly is connected with the digitized connector assembly and the CPU connector assembly. According to the embodiment of the utility model, the system can set a network for differential protection when a fault happens to the circuit of a power grid, can isolate the fault selectively and quickly under the condition of not depending on a main station, and can prevent a fault current from flowing reversely during the access of a distributed power supply.