Belt dryers are widely used in industry, mainly for drying small pieces of material and fibrous materials. And the material dried by the belt dryer has a certain shape, and it keeps a certain shape after drying. The belt dryer is composed of several independent unit sections. Each unit segment includes a circulating fan, heating unit, separate or shared fresh air intake system and exhaust system. Therefore, the operating parameters such as the amount of drying medium, temperature, humidity, and exhaust gas circulation can be independently controlled to ensure the reliability of the belt dryer and the optimization of the operating conditions.