The main principle of the air source drying heat pump used in the (drying) process is to use the heat pump evaporator to absorb the heat energy in the outside air, or to recover the waste heat of the exhaust during the drying process, and the compressor does work to transfer (transfer) the energy to the drying process. In the box, the hot air in the drying box is repeatedly heated to absorb the moisture in the material, cools and humidifies itself, and removes the moisture in the material through the process of hot air dehumidification or condensation and dewatering, and realizes the continuity of the material Dry.