The barrel of the double-shaft mixer is equipped with paddles that rotate in opposite directions. The paddles form a certain angle to stir the materials in the axial and radial directions, so that the materials can be mixed quickly and evenly. It is mainly used in the process of pre-adding water into balls. When the quantitative raw meal powder flows into the mixing tank from the feeding port, it is sprayed on the raw meal powder by several water atomization with a certain pressure, and the shaft with a qualitative length passes through the stirring blade. After stirring evenly, a ball core with consistent water content is formed, and it is transported to the pre-watered ball tray. The whole stirring is divided into three areas: atomization area, stirring area and unloading area. The hard gold cutter head is welded on the mixing blade, which has good wear resistance; it is suitable for mixing more than two kinds of fertilizers, additive premixes, compound feed, concentrated feed, and additive premixed feed.