The invention belongs to the field of feeding or discharging devices, and particularly discloses a spiral reamer. The spiral reamer comprises a material collecting section, a material conveying section and an extruding section which are connected in sequence. The extruding section comprises a shaft and an extruding blade fixed to the shaft. A cavity is formed in the extruding blade and internally provided with dyestuff. Meanwhile, an ethyl alcohol layer can be arranged in the cavity, and the extruding blade is provided with an abrasion resisting layer. Compared with a traditional spiral reamer, the abrasion situation of the spiral reamer is judged by checking whether a product has the color of the dyestuff or has the winey fragrance, the spiral reamer can be repaired in time, and a large number of disqualified products can be avoided.