Overflow launder structure of sand-water separation device

The utility model discloses an overflow launder structure of a sand-water separation device. The overflow launder structure is characterized by comprising a first overflow launder and a second overflow launder; wherein the first overflow launder and the second overflow launder are arranged in parallel and at intervals; one side of the first overflow launder, facing a water inlet pipeline, is above the water surface; the upper surface of the side of the first overflow launder opposite to the water inlet pipeline is a sawtooth-shaped overflow surface; the upper surfaces of the two sides of the second overflow launder are both sawtooth-shaped overflow surfaces; and the first overflow launder and the second overflow launder are separately connected with a water outlet pipeline. After the adoption of the overflow launder structure in the sand-water separation device, the number of the overflow surfaces is increased from one to three as the second overflow launder is added on the basis of the original first overflo