Stable transformer iron core

The utility model provides a stable transformer iron core which comprises an iron core body, iron core pieces and iron sheet layers. The iron core comprises a plurality of iron sheet layers, the plurality of iron sheet layers are laminated to form iron core sheets, the three iron core sheets are encircled to form an iron core body, the contact surfaces among the three iron core sheets are planes, each iron sheet layer is encircled by two vertical iron columns and two transverse iron yokes, the contact surfaces of the iron columns and the iron yokes are planes, and the iron columns and the iron yokes are connected through a mounting assembly. Winding fixing grooves are formed in the outer walls of the iron columns, the two ends of each iron sheet layer and the end faces of the adjacent iron sheet layers are stacked and connected through clamping assemblies, and a laminated wood block is installed in each iron sheet layer. According to the utility model, the iron core is composed of three iron core sheets, the