The invention relates to ultra-long conductive rod type part machining equipment and a center frame thereof. A rotating assembly is arranged between centering pin columns and comprises an outer base body and an inner base body, wherein the outer base body is matched with the multiple centering pin columns in jacking and pressing modes to ensure the fact that the rotating assembly and a three-jaw chuck are coaxial, and the inner base body is rotatably assembled in the outer base body; and the inner base body is provided with a penetrating mounting hole for allowing to-be-machined parts to penetrate and a centering connecting structure, and the centering connecting structure is used for being fixedly connected with the to-be-machined parts so as to make the inner base body to rotate along with the to-be-machined parts. The outer base body provides support for the inner base body, so that the middles of the long and thin to-be-machined parts are supported to prevent the to-be-machined parts from swinging during rotating; and due to the fact that the to-be-machined parts are fixedly connected with the inner base body, mutual friction does not exist between the to-be-machined parts andthe inner base body, and therefore the outer surfaces of the to-be-machined parts cannot be damaged, so that when the parts, such as conductive rods, with the large length-diameter ratio and the highsurface quality requirement are machined, the good conductive property and the machining safety of the parts can be met.