The mixer is suitable for the mixing of dry granule materials for pharmaceutical, chemical industries, etc., especially for the mixing of materials with high tonnage.The mixing tank is a cylinder-shape barrel without any stirring device inside, which makes the self-rotation around its axis and also produces turnover swing movement around its plane axis synchronized, therefore, the target materials inside the barrel could be mixed diffusely and moveable, it is featured with short mixing time, good uniformity, big output, convenient to discharge, etc..