The invention discloses a high temperature-keeping screw conveyor. A cylindrical shell (19) consists of a bushing (6) and two layers of stainless steel cylinder cavities (8), wherein the front end of the cylindrical shell (19) is welded with a front heat-isolating layer (4) and a front sealing plate (3); the rear end of the cylindrical shell (19) is welded with a rear sealing plate (11) and a rear heat-isolating layer (10); a central shaft of an auger (7) is connected with an output shaft with a motor speed reducer (13) through an elastic sleeve coupler (12); cooling water passages are formedin the central shaft and a blade of the auger (7); and a weighing module (16) is arranged on the lower part of the cylindrical shell (19). The high temperature-keeping screw conveyor has heat-isolating and protecting effects on a power transmission mechanism and prolongs the service life of the transmission mechanism. In order to achieve transfer control, the regularly and quantificationally conveying and blanking of high-temperature scattered materials are achieved through the arranged weighing module (16); and the high temperature materials can be sealed and subjected to heat preservation while being conveyed.