The design system of the energy-saving three-in-one dehumidification dryer is more simplified, with energy conservation and emission reduction as the design concept, greatly reducing the system's power consumption. This series integrates three functions of plastic dehumidification, drying and transportation into one, suitable for drying engineering plastics that have certain requirements for moisture content, such as: ABS, PC, PE, PVC, PU, etc. This model uses a non-thermal regeneration device to provide stable low dew point dry air, making it easier to dry raw materials.