The invention provides a processing method of a sulfuration chamfering mandril. The sulfuration chamfering mandril comprises a mandril main body, a lower hoop, an inner core and a baffle piece; the processing method comprises a mandril main body processing step, a lower hoop processing step, an inner core processing step and a baffle piece processing step, wherein the mandril main body processing step comprises the steps of preparingblanking for a stub bar according to the length of a center line of a product, carrying out rough turning, semi-finish turning and external grinding, then carrying out thermal bending according to a drawing, and finally, assembling after an electroplating process; the lower hoop processing step comprises the steps of preparing blanking according to a drawing, carrying out rough turning, finish turning and drilling, and finally, assembling after a deburring process; the inner core processing step comprises the steps of preparing blanking according to a drawing, carrying out rough turning, heat treatment and finish turning, then milling a cross according to the drawing, and finally, assembling after milling a plane and deburring; the baffle piece processing step comprises the steps of preparing blanking according to a drawing, carrying out wire-electrode cutting according to the drawing, and then assembling after rounding sharp edges. The sulfuration chamfering mandril is manufactured by respectively processing the mandril main body, the lower hoop, the inner core and the baffle piece, welding and assembling the lower hoop and the baffle piece, then installing the assembled lower hoop and baffle piece onto the inner core, and enabling the inner core to be welded with the mandril main body.