The processing method for a round bar blank into a synchronizer geared ring blank for vehicles are like this: feeding, heating, descaling, metal gathering, punching, discharging end face, extending molding and trimming to make the round bar into a geared ring blank with 50-78 mm diameter, 10-15 wall thickness, 45-60 mm in height. By applying rolling ring processing technique in the process, it greatly reduces the manufacturing cost, improves precision, bettering the heat treatment performance of finished parts, reducing subsequent processing quantity, with improved productivity and lengthened durability of the finished geared ring. After several times road test, compared with traditional manufacturing method, this synchronizer can lengthen durability by 30%, reduce cost 15%, and improve productivity 10%.