Flushing device for adjusting water level of cistern

The utility model discloses a water supply and flushing component device for adjusting the water level of a cistern, comprising a water supply valve arranged in the cistern and a water discharge valve for flushing. The water supply valve comprising a water supply pipe, a floating arm and a water inlet valve hole; the utility model is characterized in that the floating arm is arranged out of the water supply pipe. The upper end of the floating arm is provided with a connecting arm block that acts on a diaphragm which corresponds to a valve hole arranged on a valve body. The external wall of the water supply pipe is provided with a lifting sleeve pipe for supporting the valve body, so a lifting and regulating mechanism is formed. The utility model improves sealing effect, brings convenience for water level regulation, and is suitable for being used in a toilet bowl cistern, a solar water heater tank and a large-scale water tank.