Core rod of large dual-roller cold pilgering mill

The invention belongs to the field of metallurgical machines, and particularly relates to a core rod of a large dual-roller cold pilgering mill. The core rod sequentially comprises a left connector, a spline shaft, a plurality of core rod bodies and a right connector, wherein the left connector is used for being connected with a core rod trolley of the large dual-roller cold pilgering mill, the spline shaft is connected with a rotary feeding device and used for driving the core rod bodies to rotate, a rolling tool is installed on the right connector, the left connector, the spline shaft, the core rod bodies and the right connector are located through a stopping opening to be then connected through bolts, and flat keys are arranged at the positions of the connecting faces and used for transmitting torque. The core rod is simple and reliable in structure, convenient to disassemble and assemble, capable of reliably transmitting the rotating motion and capable of being suitable for the large side feeding dual-roller cold pilgering mill which drives the core rod to rotate.