Abstract: This paper introduces the basic status quo of material identification of power transformer windings both at home and abroad, puts forward many theoretical and applicable methods of nondestructive identification, and validates the method through the combination of big data statistics, theoretical analysis and experiment verification. Finally, comparisons were made on the advantages and disadvantages and their feasibility. This discussion has certain guiding significance and engineering application value for equipment development and standard setting of nondestructive identification method of power transformer windings.