Hydraulic separation system

The utility model relates to a hydraulic separation system which comprises a first-stage hydraulic separation box, a material receiving box and a second-stage hydraulic separation box, a feeding pipe is arranged above the first-stage hydraulic separation box, a discharging pipe is arranged at the top of one side of the hydraulic separation box, a first spiral conveyor is arranged at the bottom of the hydraulic separation box, the material receiving box is arranged below the discharging pipe, and a filtering device is arranged in the middle of the interior of the material receiving box. A circulating water pipe is connected to the end, away from the groove, of the bottom of the material collecting box, a water pump is arranged on the circulating water pipe, the circulating water pipe is connected with a plurality of first water inlet pipes through the water pump, and the first water inlet pipes are connected with the bottom of the first-stage hydraulic separation box; the second-stage hydraulic separation box