The utility model provides a spiral shell centrifuge and salt crystal dewatering system crouch relates to separation solid -liquid apparatus technical field. The utility model provides a spiral shell centrifuge crouches, including setting up at the extra -oral scraper of row sediment, it is rotatory that the pivot drives the material portion of scraping, can constantly will pile up solid particle in the aircraft bonnet inner chamber position slag notch of scraping down and discharge, can guarantee at the rotating part at a high speed when rotatory, and the inner wall with the aircraft bonnet keeps enough big space all the time, avoids futilely sediment and rotating part surface to take place high -speed wearing and tearing the, saving cost, the utility model provides a salt crystal dewatering system has been used the utility model provides a spiral shell centrifuge for sleeping in, the centrifugation is efficient, effectively save time and cost.