Efficient sedimentation tank for engineering site

The utility model discloses an efficient sedimentation tank for an engineering site. The efficient sedimentation tank comprises a tank body, wherein the tank body is sequentially provided with a sedimentation tank, a separation tank and a sludge collection tank from left to right; a vertical stirrer is arranged at the top of the sedimentation tank, the bottom of the sedimentation tank is spiral, a sludge discharge pipe and a fine particle filter plate are arranged in the sedimentation tank, and a sewage collection plate is arranged on the side wall of the sedimentation tank; and a columnar screen, a water decanter and a water outlet are arranged in the separation tank. According to the utility model, sludge is gathered to the bottom of the sedimentation tank under the action of secondary flow through the spiral structure of the sedimentation tank, the sewage collecting plate, the fine particle filter plate and the like, so that the sedimentation speed is accelerated and the purification effect is improved und