The invention discloses a spiral conveyor capable of preventing excrement blockage. The spiral conveyor comprises a shell body and a driving screw, wherein the shell body is obliquely arranged, moreover, the upper end part of the shell body is provided with an annular groove structure which is gradually inclined upwards from a feeding port to a discharging port, a sliding rod is limited in the annular groove structure, moreover, the lower end of the sliding rod is connected with a scraping piece, the scraping piece is in contact with the spiral blades of the driving screw and the scraping pieces are in contact with spiral blades of the driving screw, and the spiral blades move forwards and scrape off excrement on the spiral blades. By arranging the scraping piece capable of moving automatically, material scraping can be carried out on the packing auger of the spiral conveyor, and then the blockage caused by adhesion can be prevented.