The utility model provides a material mixing prevention divider. wherein the splitting unit is funnel-shaped, four walls of the splitting unit are closed, the upper end and the lower end of the splitting unit are respectively provided with a feed port and a discharge port, the width of the feed port of the splitting unit is smaller than that of a cavity defined by the four walls of the splitting unit, and the two sides of the lower surface of the splitting unit are respectively provided with a material guide groove. The splitting device is simple in structure, convenient to operate and capableof effectively avoiding material blocking, preventing the problem of material mixing and guaranteeing splitting accuracy.