The drying oven is suitable for the material, product hot solidification and drying de-watering in the pharmaceutical, chemical, food, farming industries, side-product, aquatic product, light industry, heavy industry and so on. Such as: Raw material medicine, crude drug, prepared herbal traditional Chinese medicine, plaster, powder, particle, drinking agent, pill, packing bottle, pigment, dyestuff, de-watering vegetable, dried fruit piece, sausage, plastics, resin, electric component, baking varnish etc.