The invention relates to a DC micro grid converter comprising a transformer, a filter unit, a converter unit, a DC flat-wave inductor and a mechanical switch, which are connected in sequence. The DC micro grid converter further comprises a short-circuit protection module, which is connected in series between the converter unit and the flat-wave inductor and includes at least two switching tubes. A DC-side short-circuit fault can be isolated quickly, impact current can be inhibited in the fault process, and the system stability is ensured.