Water-saving toilet cistern

The utility model belongs to the technical field of household sanitary equipment, specifically relating to a stool cistern which can save water. The utility model is characterized in that the inner of a cistern is equipped with a baffle which divides the cistern into a clear water cistern and a secondary water cistern, the inner of the clear water cistern is arranged with a floating valve and a discharging valve, the floating valve is communicated with a clear water pipe, and the discharging valve is connected with a flush switch of clear water, the flush switch of clear water is equipped on a cover of the cistern. The inner of the secondary water cistern is provided with an influent pipe of secondary water, a discharging valve of secondary water and a flooding pipe, wherein the position of an upper pipe orifice of the flooding pipe is lower than that of the influent pipe of secondary water, the lower pipe orifice of the flooding pipe is communicated with a flush pipe which is disposed under the discharging valve of secondary water at the bottom of the cistern, and the discharging valve of secondary water is connected with a flush switch of secondary water equipped on the cover of the cistern. The utility model combines flush closet with clear water and secondary water, thereby reducing the amount of clear water, improving utilization coefficient of water and saving water, and the utility model is simple in structure, convenient in operation.