Water-sand separator for collecting fine particles and measuring weight as well as testing method thereof

The invention discloses a water-sand separator for collecting fine particles and measuring weight as well as a testing method thereof. The separator comprises an external water tank and an internal water tank; the external water tank comprises an external cylindrical shell, an external water tank cover, and a base, an internal water tank is arranged in the external water tank, and the internal and the external water tank use the same base together; a space between the external water tank and the internal water tank form a draining chamber; the internal water tank comprises an inner water tank cover and an inner cylindrical shell; the inner cylindrical shell is internally provided with a bowl form tunnel, a tension sensor, and a gauze receiving disk, and the internal cylindrical shell is provided with overflow ports; the external water tank cover is provided with a water-sand inlet port and a gas outlet, and the water-sand inlet port traverses the external water tank cover and the internal water tank cover as