A large amount of residue is produced during food processing, such as vegetable residue after processing, food residue, fruit peel residue, etc. The screw press squeezes out the water from the residue through the squeezing action. The rotation of the screw shaft causes the residue to be constantly squeezed in the pressing chamber. The water is discharged through the drainage holes or filter screen of the press, thereby reducing the moisture content of the residue.