The invention discloses a settling tank for domestic sewage treatment. The settling tank comprises a settling tank body, wherein the upper surface of the settling tank is connected with a connecting pipe in a penetrating way; the lower end of the connecting pipe is connected with a spray head; the upper end of the connecting pipe is connected with a settling liquid box; a pressure sensor is arranged at the side surface of an inner cavity of the settling liquid box; a PLC (programmable logic controller) is arranged at the side surface of the settling liquid box. The settling tank for the domestic sewage treatment has the advantages that the structure is simple; the settling tank is suitable for treating a large amount of domestic sewage, the settling cycle is short, the control is intelligent, the time and the labor are saved; the PLC is used for controlling a pressurizing pump and a negative pressure pump to change the water pressure at the spray head, so as to adjust the injection speed of the settling liquid; the settling liquid can be more quickly and uniformly mixed into the domestic sewage by a plurality of spray heads, and the quick settling effect is realized; a filter is used for secondary filtering, so that the settling effect is further enhanced; the filter is connected with a water drain pipe through threads, so that the filter can be conveniently detached, and cleaned; the settling tank is suitable for being popularized and applied.