Sand-adding efficient sedimentation tank water treatment system and treatment method thereof

The invention discloses a sand-adding efficient sedimentation tank water treatment system and a treatment method thereof.The sand-adding efficient sedimentation tank water treatment system comprises a sedimentation tank, a sludge discharge pipe used for discharging sludge is further arranged at the bottom of the sedimentation tank, a mixing area and a sedimentation area are arranged in the sedimentation tank, a feeding box is arranged above the mixing area, and micro sand used for being fed into the mixing area is stored in the feeding box; a rotatable stirring rod used for uniformly distributing micro sand is arranged in the mixing area, a separation box used for separating the micro sand and sludge is arranged at the extending end of the sludge discharging pipe, a separation pipe used for discharging the sludge is arranged at the bottom of the separation box, and a conveying pipe used for conveying the separated micro sand is arranged at the output end of the separation box; and the conveying pipe is commun