Water-saving water tank structure for pedestal pan

The utility model discloses a water-saving water tank structure for a pedestal pan. The water-saving water tank structure comprises a recycling water tank which is arranged below a hand washing sink of a toilet, wherein a filter screen is arranged on the top of the recycling water tank; a water outlet tube of the hand washing sink extends into the top of the recycling water tank; a blow-off tube is connected on the side wall of the recycling water tank at the low end of the filter screen; a large water tank and a small water tank which are arranged in parallel are arranged above the toilet pedestal pan; the tops of the large water tank and the small water tank are communicated with each other through a first communicating tube; the bottom of the recycling water tank is communicated with the large water tank or the small water tank through a second communicating tube; a shit water-flushing tube is connected on the bottom of the large water tank; a urine water-flushing tube is connected on the bottom of the small water tank; a water flushing valve mechanism for controlling water discharge is arranged in each of the large water tank and the small water tank respectively. The water-saving water tank can be used for automatically collecting wastewater which flows down from the hand washing sink of the toilet for flushing the pedestal pan, and flushing the shits and the urine with water in the large and the small water tanks, so that the water sources are saved.