The invention provides a rolling machining structure of a motor rotor. The rolling machining structure of the motor rotor comprises a rotary shaft. The rotary shaft is sleeved with a rotor iron core, and shaft head auxiliary tools are installed on shaft heads at the two ends of the rotary shaft respectively. The shaft head auxiliary tools are composed of cylindrical lateral walls and round bottom faces, and mounting holes are formed in the bottom faces. The shaft heads of the rotary shaft are sleeved with the shaft head auxiliary tools, and the bottom faces are fixed with the shaft heads of the rotary shaft in the mode that bolts penetrate through the mounting holes. The rotary shaft is placed on two idler wheel shelves through the shaft head auxiliary tools at the two ends of the rotary shaft, and the lateral walls of the shaft head auxiliary tools make contact with the idler wheel shelves. According to the rolling machining structure of the motor rotor, the shaft head auxiliary tools are fixed outside the shaft heads, the situation that the rotor can rotate stably and safely on idler wheels is guaranteed, contact and friction between the rotary shaft and the idler wheels are effectively avoided, the precision of the rotary shaft is better protected and the bearing assembling quality is improved.