Vertical mixer is the upgrade substitute of Z type mixer, which is utilized for mixing and drying of cemented carbide powder with rubber or paraffin as binders. It has such characteristies as more uniform mixture of rubber or paraffin, rapid drying, higher efficiency, lower energy consumption and easier operation. Its vertical structure makes it convenient to separate stir chamber and stir axes when loading and unloading. It works under vacuum and the medium can be recycled.