Dewatering and drainage device

The utility model relates to a dewatering and drainage device, and belongs to the technical field of building operations. The device comprises a water collecting pit body with a bottom pad layer, water filtering materials are arranged in the middle of the bottom pad layer, waterproof materials are arranged on the periphery of the bottom pad layer, a pit wall is built upwards on the periphery of the bottom pad layer and covered with a cover plate with a drainage through pipe and a wire through pipe, the lower end of the drainage through pipe is communicated with a water outlet of a submerged pump arranged on the bottom pad layer, and a cable in the wire through pipe is connected with the power supply end of the submerged pump. A traditional construction method is broken through virtually, a brand new construction method of apparent drainage but actual dewatering by means of the 'pit in pit' form is realized, the phenomenon of water gushing occurring in the initial set process of concrete is eradicated, the influence on a bottom plate of a basement by underground water is effectively reduced to zero, and then the follow-up building operation quality is ensured.