Dehydrating and drying device

The utility model discloses a dehydrating and drying device (1), which is provided with a centrifugal dehydrator (2), a cyclone air-flow drier (5) and a wet powder feeder (4), wherein the wet powder feeder (4) is provided with an outer barrel (41), a feeding hole (42), spiral blades (43) for carrying wet powder to the cyclone air-flow drier (5), a sliding base (46) provided with a spiral fixing part (45) for fixing one end of a shaft of the spiral blades (43), and a slide rail (44) on which the sliding base (46) slides along the shaft of the spiral blades (43).