Dehydrator for sludge treatment

The invention relates to the field of sludge dewatering, in particular to a dewaterer for sludge treatment. Comprising a rack, a dewatering device, a driving device and a pressure bearing part, an upper sealing plate and a lower sealing plate which are arranged in parallel are arranged on the rack, the dewatering device comprises a fixed shaft, a movable shaft, a guide structure and two extrusion parts, and each extrusion part comprises a hinge shaft, a first vertical filter plate and a second vertical filter plate; the first vertical filter plate, the second vertical filter plate, the upper sealing plate and the lower sealing plate define a dewatering cavity, when the content of sewage in sludge is large, the pressure bearing piece drives the hinge shaft to slide from the initial position to the forward extrusion position, so that the first vertical filter plate and the second vertical filter plate are far away from each other to increase the filtering area, and the sludge is rapidly extruded and dewatered i