Virtual manufacturing technology is an advanced manufacturing technology which has arisen these years.Sustained by modeling technology, emulating technology and virtual reality technology, even before product design or physical reality of manufacture system, it can make people realize the capability of future product or the state of manufacture system,thus facilitating the advanced decision-making and optimal implementation plan. The character of virtual manufacturing technology of rollers is introduced, the classification and definition of virtual manufacturing technology of rollers is expatiated and the key technology of virtual manufacturing of rollers is discussed.