The invention relates to a rotor winding machine. The rotor winding machine comprises a machine body, a positioning rod, a transmission box, a winding device, a support disc, a line breaking device, a copper wire outgoing barrel and a tension adjustment rack, wherein a motor and a stepping motor are fixedly arranged inside the machine body, the motor is used for driving the winding device to rotate, the stepping motor is used for driving the positioning rod to move, a moving plate is arranged at the front part of the upper end of the machine body, the positioning rod is fixed on the moving plate, the transmission box is fixed at the rear part of the upper end of the machine body, the winding device is fixed on a front panel of the transmission box by a rotation shaft, a winding rack is fixed at the front end of the rotation shaft, the line breaking device is fixed at the upper part of the transmission box by a support rod, the positions of the positioning rod, the winding device and the line breaking device correspond to each other, the support disc is fixed at the upper part of the transmission box, and the copper wire outgoing barrel and the tension adjustment rack are fixed on the support disc. By the rotor winding machine, a copper wire can be effectively prevented from being broken during the winding process, manual interference is reduced, and the production efficiency is improved.