Water tank fitting for two-grade water-saving sanitary ware

The utility model discloses a water tank fitting for a two-grade water-saving sanitary ware, which is a two-grade flushing key device which is arranged on the wall of a water tank of a water closet and can separately control flushing water in large current and in small current, namely a dual key device. The utility model comprises a large current flushing water key, a small current flushing water key, a large current flushing water lifting rod, a small current flushing water lifting rod, a flushing water lifting rod swing seat, a lifting rod pushing block, a seat pin, a compression spring, a rubber pad, a guide sleeve, a screw nut, a screw nail, and a pull thin line. The large current flushing water key and the small current flushing water key are respectively pressed to drive the large current flushing water lifting rod and the small current flushing water lifting rod to swing high and to pull the pull thin line to respectively open a large current flushing water draining valve and a small current flushing water draining valve, and the purpose of separately flushing stool and urine with different water quantities is realized. The utility model is not only water-saving but also convenient.