The screw press dehydrator is widely used in the dehydration of high-humidity slag materials before drying, such as the dehydration of distiller’s grains, pomace, medicinal residue, cassava residue, etc., which can remove about 20% of the moisture in the material and greatly reduce the burden on the dryer. The output is greatly increased, and the energy consumption is greatly reduced. It is an indispensable processing equipment for high-humidity materials before drying. The dehydrated materials can directly enter the drying equipment, which greatly reduces the drying energy consumption.