Mechanization and automation are the general trend of Investment casting in the world. The paper briefly discusses the sandblasting process of investment, and introduces the shell casting process. Carrying manipulator design is proposed to complete the investment casting process. The terminal arm and other major components of structural design are discussed. The terminal clamping structure is modeled. The parameters of the terminal clamping structure are designed. The research can provide some reference for the development and design of grouting sandblasting carrying manipulator based wax casting-line.