To obtain a crude refuse treating device adequate for executing the treatment of crude refuse into which water is incorporated.

This crude refuse treating device comprises a blade shredding shaft of a shredding section for shredding the crude refuse, a dehydrating screw 9 for dehydrating the shredded crude refuse and a decomposing and annihilating section 13 for decomposing the crude refuse by microorganism-component to gases and water and remarkably annihilating the crude refuse. The crude refuse fed from a feeding port is blade shredded by the blade shredding shaft and is passed through the sealing water formed of a partition plate and drain port. While the crude refuse is rotated together with the water by the dehydrating screw 9, the crude refuse is lifted upward. At this time, the crude refuse is passed through a filter 10 on the sidewall of the dehydrating screw 9, by which the water and the crude refuse are separated. The crude refuse separated from the water is transferred to the decomposing and annihilating section where the crude refuse is decomposed and annihilated by the microorganism-component.