Dewatering machine capable of controlling moisture content

A dewatering machine comprising:

• a screen having a hollow inside, having an inlet portion through which livestock manure is inputted at a first side and an outlet portion through which dehydrated livestock manure is outputted at a second side, and having a plurality of moisture exhaust holes penetrating from an inside of the screen to an outside of the screen;
• a screw comprising a rotation axis and a plurality of main wings, the main wings arranged in a spiral shape along a longitudinal direction of the rotation axis;
• and
• a plurality of moisture content control wings disposed between the main wings adjacent to the outlet portion, the moisture content control wings extending in a spiral shape along the longitudinal direction of the rotation axis,
• wherein each of the moisture content control wings has a predetermined length, such that the moisture content control wings do not overlap with each other along the longitudinal direction of the rotation axis,
• wherein the moisture content control wings comprises at least three moisture content control wings spaced apart from each other when viewed along the longitudinal direction of the rotation axis, and a length of each of the moisture content control wings is less than ¼ of a length of an arc of the rotation axis of the screw.