The bean dregs dryer production line adopts a special internal structure, and the material is quickly reduced to less than 12% (which can avoid the occurrence of gelatinization and saccharification of the material during the drying process, resulting in black appearance of the material). It adopts novel sealing device and is equipped with a good thermal insulation system, which effectively reduces the coal consumption of the drying system. The overall system has good sealing performance, and is equipped with a perfect dust removal device. The whole drying system adopts electrical centralized control, and the hot air temperature is automatically adjusted, with a high degree of automation and convenient operation. After the drying process, it can be connected with subsequent sections such as crushing, mixing, granulating, and packaging to produce finished bean dregs pellets.