The utility model provides a solid -liquid separating device. This solid -liquid separating device includes: the cell body has bottom and lateral wall, is provided with first discharge gate on the bottom, is provided with the supernatant export on the lateral wall, cyclone sets up in the inside of cell body, and cyclone includes thick liquids inlet pipe, underflow export and overflow mouth, screw conveyer, the slope sets up in the below of cell body, last feed inlet and the bin outlet of being provided with of screw conveyer, the feed inlet is linked together with first discharge gate. Above -mentioned device is special cyclone and the integrative combination equipment of screw conveyer, makes the ore pulp thin including the granule, that viscidity is high carry out the liquid solid separation through cyclone earlier, in the extruded underflow sinks to the screw conveyer of bottom in advance, take the cell body out of after screw extrusion, dehydration. Not only guaranteed original process operation continuity, alleviateed workman intensity of labour, guaranteed the supernatant quality, and saved filtration equipment. In a word, utilize the device to carry out solid -liquid separation to thick liquids, separation efficiency is high, and the cost is lower.