Drainage device for water conservancy project foundation treatment

The utility model provides a water drainage device for water conservancy project foundation treatment. The water drainage device comprises a plurality of water drainage assemblies and a plurality of water collection tanks, and the water collection tanks correspond to the water drainage assemblies in a one-to-one mode; the multiple drainage assemblies are distributed on the periphery of a foundation pit on a foundation at equal intervals. Each drainage assembly comprises a water seepage pipe with one closed end, a submersible pump and a water suction pipe. The closed end of the water seepage pipe sequentially penetrates through and extends into the foundation from top to bottom, a filtering layer is arranged on the outer wall of the water seepage pipe, the submersible pump is arranged at the inner bottom of the water seepage pipe, and a water outlet of the submersible pump is connected with one end of the water suction pipe; a water inlet is formed in each water collecting tank and is communicated with the oth