Sand separator, also known as sand screening machine. The use of certain screening machinery, the gravel and sand to separate a mechanical, generally by mechanical chassis, rack, gear, conveyors, trommel, shaker, sliding screens, spray guns, engines or motors and other components of the use of the device could solve the problem of pollution waste concrete, and conserve resources. Not only can waste concrete mixer in the sand, stone, Whey-time automatic separation of clean and ensure that sand, stone, water reuse, wastewater through three settling ponds, sedimentation and then pumped into the recycling machine achieve a completely zero discharge of sewage, which saves resources and protect the environment, reflects the true sense of the machine design is reasonable.