The invention discloses a method for judging and processing a large-span interphase short circuit grounding fault. A fault type and a fault region are comprehensively judged according to information of fault current which flows through each feed line switch by combining a zero sequence voltage criterion under an acquisition fault; and fault recovery is performed by adopting corresponding steps, so that the processing problem of the large-span interphase short circuit grounding fault can be solved well. The method is simple and practical, and complicated operation is not needed.