Suzhou Xinkunyuan's sludge low-temperature heat pump drying machine represents the latest technology application trend in the field of sludge drying reduction. It completely solves the remaining technical defects such as high energy consumption, low efficiency, high moisture content, excessive odor emission, and high-temperature dust in the drying process of traditional technology routes. It achieves closed work without heat loss, no odor emission, low temperature safety and no dust, and the moisture content of dry sludge can be reduced to