Toilet water tank with no-inflow automatic control mechanism

The invention relates to a toilet water tank with a no-inflow automatic control mechanism, which is characterized in that an opening at the upper end of the water tank of a toilet is provided with a plastic sealing cover matched with the opening, and the sealing cover is sealed; hole sites corresponding to a feeler lever of a drainage key and a touch key of a drainage mechanism in the water tank are arranged in the plastic sealing cover; flexible rubber sleeves are arranged in the hole sites and hermetically and tightly connected to form the whole water-proof sealing toilet water tank. Tap water automatically stops when filling the water tank after flushing to make the water tank in the static state of waiting drainage. The invention makes the structure of an inflow device of the toilet water tank be simplified and solves the technical problem that the inflow automatic control mechanism of the traditional toilet water tank fails frequently.