The sustainable water purification and flood control sandbag uses a high-density sponge material inside to quickly absorb the floodwater in, and at the same time, the polluted floodwater will be purified by the sewage purifier under the sandbag. Finally, the polluted flood water will be converted into a clean and hygienic drinking water source. This design effectively solves the problems of slow water absorption, low drainage efficiency, and difficult transportation of traditional sandbags, provides hygienic drinking water resources for the disaster-stricken people, improves the living environment conditions of post-disaster areas.