The invention relates to a water-sediment separation device, in particular to a water-sediment multistage filtration and separation device, which consists of a support, a tank body, a filter barrel, amotor, discharge pipes and collection barrels. The motor is disposed outside the tank body and is fixedly connected to the top of the tank body, a motor shaft is connected to a transmission shaft, the transmission shaft extends downward into the tank body, the filter barrel is vertically arranged in the tank body, the filter barrel is internally equipped with several filter groups, each filter group consists of a collection plate and a filter screen, the transmission shaft is fixedly connected to the filter screen, the lower surface of the filter screen is fixedly connected to a scraping plate, the upper end of the transmission shaft is fixedly connected to impellers, the filter barrel is equipped with discharge holes, the discharge holes are internally equipped with discharge valves, oneends of the discharge pipes are in fixed connection with the discharge holes, and the other ends pass through the tank body and extend out of the tank body, the collection barrels are disposed belowthe orifices of the discharge pipes, and different filter groups have different filter screen apertures. The device with the above structure can realize classification, separation and collection of sediment in water, and the same time also accelerate the filtration and separation rate.