The utility model discloses an amorphous alloy solid triangle folding iron core used for a three-phrase transformer. The amorphous alloy solid triangle folding iron core used for the three-phrase transformer comprises three identical independent amorphous alloy folding iron core frames, the cross section of each independent amorphous alloy folding iron core frame is in a rectangular shape, and the three identical independent amorphous alloy folding iron core frames are spliced at a central angle of 120 degrees to form a closed solid triangular magnetic passage. The amorphous alloy solid triangle folding iron core used for the three-phrase transformer solves the problems that the cost is high, process requirements are high, designed space use ratio is low, unit iron loss is big, sleeve and assembly are difficult, noise is high and short-circuit resistance capacity is bad in the prior art and has the advantages of being simple in structure, low in manufacturing cost, low in process requirements, high in designed space use ratio, simple in sleeve and assembly, low in noise, small in unit iron loss and good in short-circuit resistance capacity.