Convenient domestic water-saving tank

The utility model provides a water-saving flume for domestic uses, comprising a primary flume above and a secondary flume below with stepped set from top to bottom, which are connected with a stoma for water flowing at the bottom of the primary flume with a further comprised drainage-hole, together with the one at the bottom of the secondary flume, connects with the floor of wastewater pipe through the pipelines. Compared with the current technology, the flume uses the natural flow under the condition of different height of the two flumes to achieve the aims of water-saving by utilize water repeatedly. The model has the advantage of reasonable design, simple structure, convenient use and full use of water resources which possesses a high value in popularization and application.