The invention discloses a water separation system which comprises a water separator and a sediment separator, wherein the water separator comprises a water separation hopper, a first conveying belt, a second conveying belt, a material feeding hopper arranged above the second conveying belt, a backwashing mechanism for driving upper-layer water in the water separation hopper to enter the water separation hopper from the bottom of the water separation hopper, a material separation mechanism matched with the second conveying belt, and a water drainage mechanism communicating with the water separation hopper; and the sediment separator comprises a sedimentation box, a filtering mechanism, spiral blades arranged at the bottom of a sedimentation cavity, a conveying motor for driving the spiral blades to rotate, a sludge discharging pipe communicating with the sedimentation box, and a sludge discharging valve arranged at a sludge discharging opening. According to the water separation system disclosed by the invention, crushed materials entering the water separation hopper are flushed through the backwashing mechanism, so that metals are separated from impurities; heavier metals are conveyed out through the second conveying belt, and part of the lighter impurities are conveyed out through the first conveying belt; non-separated metals are screened through the filtering mechanism, and fine impurities are discharged through the spiral blades after being settled; and the water separation system realizes automatic separation of the crushed materials, and is high in treatment efficiency and low in cost.