With regard to the structure of GSD tube bundle dryer, a rotatable heating tube bundle is installed inside the fixed shell. Steam flows into the tube via the rotary joint for heat transfer, turns into condensate and then is discharged. The moisture in the material is heated outside the tube and turns into steam and then is discharged by a negative pressure fan. The material is threw away in the tube bundle by shovels, evenly falls to the outside surface of heating tube, and is pushed from the feeding inlet end to discharging outlet end to achieve good drying effect. GSD tube bundle dryer has been widely used for drying loose material in the chemical industry, light industry, food, further processing of cereals, feed and other industries, such as corn starch germ, protein powder, fiber and feed; alcohol and vinasse; bone meal, fish meal; granular or powdery fertilizer, inorganic mineral, etc.