Basement bottom plate drainage device

The utility model discloses a basement bottom plate drainage device which comprises a structural bottom plate and is characterized in that a bottom plate waterproof layer is laid below the structural bottom plate, a base plate is arranged below the bottom plate waterproof layer, a drainage ditch is formed in the upper portion of the structural bottom plate, drainage holes are formed in the drainage ditch, and drainage holes are formed in the drainage ditch. A drainage hole vertically penetrates through the structure bottom plate and the base plate, the inner wall of the drainage hole is tightly attached to the outer side wall of a sleeve, a drainage valve is arranged at the upper end of the sleeve, the sleeve is detachably connected with a filtering device, the lower end of the filtering device is in threaded connection with a porous water inlet head, and geotechnical cloth is laid on the inner wall of the porous water inlet head. Coarse sand and gravel are sequentially arranged in the porous water inlet head