Abstract: In the manufacturing of ultrathin diamond tools by the press-sinter process,the distribution uniformity of diamond powder,matrix and alloy filler in the mold has a great impact on the finally using performance of the diamond tool.At present,domestic enterprises generally finish the mix by manually,which is difficult to meet the requirements of uniformity and consistency,so the quality of production and batch stability mostly are bad.Based on the research of distribution characteristics of particles in the tool mold,we designed an experimental device which could realize automatic mix of powders,and greatly improved the uniformity and consistency of the diamond tool forming materials,thus improving the durability of the tool,enhancing the market competitiveness of diamond tools,and reducing the use-cost of the buyer.