Industrial and agricultural multi-functional dryers are a kind of drying equipment widely used in agriculture and industry. These devices usually use heat pump technology, which is more energy efficient and environmentally friendly than traditional drying equipment. Known for energy saving, safety, environmental protection and high quality, they are widely used in grain drying, Chinese herbal medicine drying, agricultural and sideline products drying, seafood drying, as well as furniture and building materials, sludge drying and other fields.