分析了混粉电火花加工粉末颗粒沉降过程，提出了保持混粉浓度均匀一致的搅拌方式，对混粉电火花加工装置工作液箱的搅拌进行了设计，实践验证是实用的． The sedimentation process of mixed powder EDM powder particles was analyzed. The mixing method of keeping the powder concentration uniform and uniform was put forward. The mixing of the working liquid tank of the powder mixing EDM device was designed and proved to be practical.