Abstract: It introduces the working principle of a new type of combined powder separator for the separation of manufactured sand and the common production process of machine-made sand, and analyzes the problems existing in the actual production of manufactured sand. The combined coarse and fine sand separator can not only effectively adjust the particle size and gradation of machine-made sand, but also simplifies the process flow, eliminates the need for fine screening equipment with low operating efficiency, effectively improves the separation efficiency and reduces the system process power consumption.