The invention relates to a staggered floor reclaimed water reuse system for a high-rise public building. The system comprises treatment equipment and storage equipment, wherein the treatment equipment is arranged in each floor except the ground floor and comprises a raw water input end, a reclaimed water output end and a sewage output end, the raw water input end is connected with drainage ports of water basins on the same floor, the reclaimed water output end is connected with the storage equipment on the lower floor, and the sewage output end is connected with a sewage header pipe; the storage equipment is arranged on each floor except the top floor and connected with urinals on the same floor. The staggered floor reclaimed water reuse system for the high-rise public building is a revolutionary product of reclaimed water reuse systems for buildings, reclaimed water reuse can be widely popularized and applied in the public buildings, and the reclaimed water reuse system makes a great contribution to effective resolving of an increasingly pressing problem of severe shortage of urban water resources in China.