River/lake pollution sediment treatment residual sand regeneration system

The invention is suitable for the technical field of environmental treatment, and provides a river/lake pollution sediment treatment residual sand regeneration system. The system comprises garbage sorting equipment for separating garbage from pollution sediments and sorting out sediment mixtures, and sediment separation equipment for precipitating the sediment mixtures to obtain resource recycling residual sand, wherein the sediment separation equipment includes a sand precipitating device for collecting and precipitating the sediment fixtures according to the particle size and the density of particles, a sand extracting device for extracting the sand, and a washing device for washing pollutants attached on the extracted sand. The residual sand regeneration system uses the sand precipitating device for realizing natural separation of the sediments in the sediment mixtures; the sand with higher density and particle size is remained at the bottom of the sand precipitating device; the sand extracting device is used for extracting the sand; and the washing device is used for washing to remove such poisonous substances as heavy metal and organic matters attached on the surface of the sand, so that the washed sand becomes the resource recycling residual sand.