Detection device and method for measuring sand content of outlet water of foundation pit dewatering well

The invention relates to the technical field of foundation pit dewatering, and particularly discloses a detection device and method for measuring the sand content of outlet water of a foundation pit dewatering well, and the detection device comprises a conveying pipe communicated with the dewatering well, and an inner cylinder assembly which is used for separating sand and water and is communicated with the conveying pipe; the inner cylinder assembly rotates around the axis direction of the inner cylinder assembly. The detection method specifically comprises the following steps that the conveying pipe conveys water in the dewatering well into the inner cylinder assembly, and meanwhile the inner cylinder assembly is controlled to rotate through the rotation driving mechanism; water entering the inner cylinder assembly is separated into water and sand under the action of centrifugal force; wherein the separated water is discharged through the water outlet, and the separated sand is collected in the sand setting