Center column type thickener

The utility model discloses a center column type thickener which comprises a bridge frame and a rake frame, a center stand column is arranged between the bridge frame and a groove body, a transmission cage frame is arranged outside the center stand column, a feeding device is further arranged below the bridge frame and comprises an inner feeding well and an outer feeding well, the bottom of the inner feeding well is an inclined plane, and the bottom of the outer feeding well is an inclined plane. An inclined surface is arranged at the bottom of the outer feeding well, a discharge hole is formed between the bottommost end of the inclined surface and the outer wall of the inner feeding well, a feeding pipe is arranged below the bridge frame and is communicated with the inner feeding well, a plurality of flocculant feeding pipes are arranged above the feeding device, and the bottom of the outer feeding well obliquely extends towards the direction of a central shaft in the circumferential direction to form a slop