Sedimentation tank of sewage treatment system

The utility model relates to the technical field of sewage treatment, and discloses a sedimentation tank of a sewage treatment system, which comprises an upper component and a lower component which are separated from each other, the upper component integrates a guide cylinder design and an effluent weir design, and specifically comprises a middle hanging bracket, an effluent weir hanging bracket, a guide cylinder and an effluent weir component which are spliced with each other; the lower assembly is integrated with the design of a mud collecting hopper and specifically comprises a plurality of framework blocks and a plurality of skin blocks. The upper assembly and the lower assembly are each of a disassembly and assembly combined structure, all parts of the sedimentation tank of the sewage treatment system can be prefabricated and machined according to the shape of the tank body, all the parts designed in a split mode can meet the road transportation requirement, rapid assembly of the sedimentation tank can b