Potato starch separator

The utility model discloses a potato starch separator which comprises an extrusion device and a machine frame. The extrusion device comprises a cylindrical casing and an extrusion rotating shaft, wherein the extrusion rotating shaft is supported on a main axis of the casing, and one end of the extrusion rotating shaft penetrates through the casing. The potato starch separator is characterized in that a helical blade is fixed on the extrusion rotating shaft, the outer edge of the helical blade and an inner wall of the casing are tangent to each other, the casing is fixed on the machine frame, a feeding port is arranged on the upper portion of the casing, a slag hole is arranged on a side wall of the other end of the casing, a starch outlet is arranged on a lower plate of the casing, and a filter screen is fixed on the starch outlet. The potato starch separator has the advantages that the separator is simple in structure, starch and impurities can be separated directly, follow-up work treatment is not required,