The total gyratory movement of the square gyratory sifter can rapidly spread, stratify and separate the material. The unique gyratory motion can quickly spread the material across the full width of screen at the feed end, driving the particles move forward contact with the screen surface. The large horizontal amplitude can improve the sieving effect of the near-size particles, and can improve the material handling capacity of the machine. gyratory sifter can be equipped with one to nine layers of screen, which can complete the sieving from 12 mesh to 325 mesh. It can be designed as duplex screening to make it more productive. The design is compact and energy efficient.