The utility model discloses a reinforcing structure used for a three-frame and three-column type amorphous alloy transformer core. The three-frame and three-column type amorphous alloy transformer core comprises an outer frame iron core and two inner frame iron cores, wherein the two inner frame iron cores are located in a window frame of the outer frame iron core side by side and contained in the outer frame iron core, and a pair of triangular areas hung in the air correspondingly exist between the inner surfaces of upper iron yokes and lower iron yokes of the two inner frame iron cores and the outer frame iron core. The reinforcing structure comprises insulating cushion blocks, rubber shock pads and at least one metal fastening belt, and one insulating cushion block is tightly supported in each triangular area hung in the air; the rubber shock pads are arranged between the contact faces between the outer peripheral sides of the insulating cushion blocks and the peripheral sides of the triangular areas hung in the air in a padding mode; each metal fastening belt is arranged by surrounding the outer peripheral side of the outer frame iron core. The reinforcing structure can prevent deformation and displacement of the upper iron yokes and the lower iron yokes of the inner and outer frame iron cores, and deformation of hanging drapes and loosening of laps of the lower iron yokes are prevented when the outer frame iron core is hung in a device.