Laminated screw type sludge dewatering machine and use method thereof

The invention relates to the technical field of sludge dewatering, and discloses a laminated screw type sludge dewatering machine and a use method thereof. The technical scheme key point comprises that provided is the laminated screw type sludge dewatering machine comprising a laminated screw body and a flocculation mixing device arranged on one side of the laminated screw body. A pretreatment device is arranged on one side, far away from the laminated screw body, of the flocculation mixing device; the lower side of a precipitation tank communicates with the flocculation mixing device througha sludge conveying pipe, and the upper side of the precipitation tank is provided with a liquid discharge pipe for discharging out a clear liquid. The use method of the dewatering machine comprises the following steps: pre-treating sludge in a pre-treatment tank, precipitating in the precipitation tank, discharging out a clear liquid obtained from first separation through the liquid discharging pipe, carrying out secondar