Household water-saving system

The utility model belongs to the technical field of household water saving. Especially household water saving system, water basin, two pipe joints are fixedly arranged at the bottom of the water basin; one end, far away from the basin, of the outer side wall of the pipe joint is in threaded connection with a first sleeve; the side, away from the pipe joint, of the outer side wall of the first sleeve is fixedly connected with two connecting pipes, the end, away from the first sleeve, of the outer side wall of each connecting pipe is fixedly connected with a second sleeve, and the bottoms of theinner walls of the two second sleeves are in threaded connection with a connector and a third water pipe correspondingly; press of second button, according to the water-saving toilet, sewage flows into the first water pipe and then is discharged out of a sewer through the first water pipe, when the sewage is clean, a third button is pressed, the clean sewage can be conveyed into the water tank through the third water pip