The utility model provides a leading stagnant water post -cast strip structure of bottom plate includes bottom plate, post -cast strip at least, props the muscle, lacing wire, water drainage tank, caulk district, rubber waterstop and recess, the bottom plate sets up the lower extreme in the post -cast strip to the muscle supports the bottom plate and the lacing wire is fixed through propping, it sets up inside the bottom plate perpendicularly to prop the muscle, water drainage tank sets up the bottom at the bottom plate to water drainage tank's the upper end and the lower surface zonulae occludens of bottom plate, the recess symmetry sets up the both ends at water drainage tank to recess and water drainage tank zonulae occludens, the rubber waterstop is disposed under the water drainage tank to be provided with the district that caulks in the both sides of rubber waterstop, district and rubber waterstop zonulae occludens caulk to caulk to distinguish and fix at the bottom plate lower extreme through the lacing wire, this leading stagnant water post -cast strip structure of bottom plate is simple, and the prevention of seepage is effectual, and the drainage is convenient, and it is big to bear pressure, and the practicality is strong, easily uses widely.