To provide a solid-liquid separator, which simplifies a device configuration and a solid-liquid separating process, reduces power costs, and facilitates installation to a construction site or the like.

In the solid-liquid separator 1 having a water absorption conveyer 2 separating a solid content Wb and a liquid content Wa from an object W to be conveyed using a solid-liquid mixture as the object W to be conveyed, the water absorption conveyer 2 includes a roller part 3 consisting of a pair of rollers 4a, 4b, two rotation belts 5, 5 hung around between the roller parts 3 in an axial direction of the roller 4a(4b) at a predetermined interval, a plurality of water absorption sheets 11 in which one end 11a is held by the rotation belts 5, 5, and at the same time, the other end 11b turns to a free end and is laid between two rotation belts 5, 5 to form a water absorption belt 10 together with a circulating route Y of the rotation belts 5, 5, and a pair of wastewater rollers 15a, 15b nipping the water absorption sheets 11 to drain from the water absorption sheets 11.