Former sterilization for Chinese herbal medicine usually adopts epoxy ethane etc. These methods are hard to ensure medicine property, easy to have remains and will have expensive costs. By testing, steam is the most suitable sterilizing method for herbal medicine. So we designed this series of sterilizer. Is adopts horizontal rectangular shape and in-and-out steam heating. So that the space of the cabinet will be fully utilized. In the cabinet, there is a special dampproof device toeliminate effectively lump phenomena of herbal powder caused by traditional steam sterilization.