Multifunctional sludge thickening tank

The utility model discloses a multifunctional sludge thickening tank which comprises a sludge preparation well, a sludge thickening tank and a phosphorus removal tank, the mud preparation well comprises a mud inlet area, mud preparation areas and a mud storage area, mud preparation weirs are arranged between the mud inlet area and the mud preparation areas so as to adjust the mud inlet amount of the mud inlet area flowing to the mud preparation areas, the mud preparation areas are symmetrically arranged on the two sides of the mud inlet area, the mud inlet area and the mud preparation areas are fixedly connected with the outer edge of the upper portion of the mud storage area, and the mud storage area is fixedly connected with the mud inlet area. The sludge preparation area is communicated with a sludge concentration tank through a first sludge discharge pipe, the bottom end of the sludge concentration tank is communicated with the sludge storage area through a second sludge discharge pipe, a layered water di