Industrial sludge has a high moisture content and disposal is charged by weight - this is a "pain point" for countless factory environmental costs. The sludge moisture content still reaches 65% ~ 85% after the plate-frame filter pressing and stacking screw machine treatment, which is far from reaching the optimal reduction state. The low-temperature heat pump type sludge drying equipment independently developed by Suzhou Xinkunyuan Environmental Protection Co., Ltd. is used as a supporting equipment for the back-end filter pressing to make wet sludge with a moisture content of 70% to 83%.