The invention discloses a screw conveyer. The screw conveyer comprises a rotating motor (1), an inner shaft (2), transmission components (3), outer shafts (4) and vanes (8). The inner shaft is a water-cooled hollow shaft. The outer shafts are arranged at the exterior of the inner shaft in a sleeving mode at intervals in the radial direction to form radial-directional separating spaces used for heat insulation between the inner shaft and the outer shafts. The transmission components are arranged in the radial-direction separating spaces for being connected with the inner shaft and the outer shafts in a transmission mode. The screw conveyer is provided with a feeding opening (53) and a discharging opening (54). The rotating motor drives the inner shaft to rotate, then the outer shafts and the vanes are driven to rotate through the transmission components, so that high-temperature materials entering from the feeding opening outflow from the discharging opening under the function of the vanes. According to the screw conveyer, the screw conveyer can run for a long time in the high temperature, the structural rigidity and strength are ensured; meanwhile, heat conduction between the inner shaft and the outer shafts is greatly reduced, and the fact that lots of heat of the high-temperature materials is taken away by cooling water of the inner shaft is avoided; and the outer shafts mainly bear the high temperature, stressed torque force is low, conventional high-temperature-resistant materials are selected and used, and the screw conveyer can run for a long time in the high temperature.