Vacuum water-saving public toilet

The invention discloses a vacuum water-saving public toilet, comprising a vacuum toilet, a urinal, a clean water tank, a gray water tank, an intermediate tank and a vacuum sewage tank, wherein the gray water tank is configured to receive water drained from a wash basin and treat the drained water for flushing the vacuum toilet and the urinal; the clean water tank is configured to provide hand washing water, and to provide clean water for flushing the vacuum toilet and the urinal when the water in the gray water tank is insufficient; the intermediate tank is configured to receive and temporarily store sewage from the urinal, and discharge the sewage to the vacuum sewage tank when a certain amount of sewage is accumulated; the vacuum sewage tank is configured to have a certain degree of vacuum and suck sewage in the vacuum toilet and the intermediate tank in vacuum. The vacuum water-saving public toilet can reduce the water consumption of public toilets, improve the utilization rate of waste water, avoid the ov