Fecha de publicación: 23/01/2024 Fuente: WIPO "circular economy" The utility model belongs to the technical field of farms, and particularly discloses a negative pressure system for sewage collection of a large-scale farm. The negative pressure pipe group comprises a collecting pipeline connecting end and a manure water collecting system connecting end, the collecting pipeline connecting end is connected with a collecting pipeline, and the other end of the collecting pipeline is arranged in the manure accumulation pool; the liquid dung collecting system is connected with the liquid dung collecting system connecting end; at least part of the slag suction pipe is arranged in the manure pit, one end of the slag suction pipe is communicated with the collecting pipeline, and the other end is close to the bottom of the manure pit; the water floating switch is arranged at the end part of one end, which is arranged in the manure pit, of the collecting pipeline; the gate valve is used for controlling connection and disconnection of the slag suction pipe and the collecting pipeline; according to the device, automatic operation can be achieved, the working efficiency is improved, personnel are prevented from being corroded by liquid dung and invaded by viruses, meanwhile, the liquid dung and the dung residues are separately collected, and follow-up dung residue treatment is facilitated.