Multi-stage sedimentation rake-free concentration device comprising layer-drop diversion sedimentation screen

The invention relates to a multi-stage sedimentation rake-free concentration device comprising a layer-drop diversion sedimentation screen. The device comprises a central tank body, a diversion settling area is arranged on the outer side of the central tank body, the diversion settling area comprises a layer-drop diversion sedimentation screen and a magnetism gathering sprayer, the layer-drop diversion sedimentation screen comprises a plurality of third diversion settling subgroups which are sequentially arranged downwards along the outer wall of the central tank body, in every two adjacent settling tanks, slime water flowing out from the settling tank at the upper portion is flown into the settling tank at the lower portion, each third diversion settling subgroup comprises a settling tank, the bottom plates of the settling tanks are provided with third underflow discharge ports for discharging settled fine coal slime, and completely settled water is output from a third overflow discharge pipe at the output e