A wobble-plate machine of dough that base on existed normal machine is developed to satisfy many requirements including safety and hygiene, efficiency and lower cost in production line of steamed bread. Design scheme of the whole machine is made according to the working environment , and a 3D model is built based on Pro/E. This machine consists of manipulator which can complete grasp, separate, place and press, frame and driving cylinder etc. According to its basic construction and working principles, driving plan is designed, flow chart and pneumatic system schematic can also be shown. The virtual simulation experiment in ADAMS proves the feasibility of design scheme. This study will supply technology support for further automatic production line of steamed bread.