Post-cast strip advanced water stop structure of basement retaining wall

The utility model discloses a post-cast strip advanced water stop structure of a basement retaining wall, which comprises the basement retaining wall, a post-cast strip is arranged in the middle of the basement retaining wall, a first water stop steel plate is embedded in each of two sides of the post-cast strip, a guide wall protruding outwards is arranged on one side of the basement retaining wall, and a second water stop steel plate is embedded in the middle of the guide wall. The structure is characterized in that a horizontal construction joint is formed in the lower end of the basement retaining wall in the length direction of the basement retaining wall, a reinforced water-stop steel plate with the top extending out of the horizontal construction joint is embedded in the basement retaining wall at the horizontal construction joint, and the middle of the reinforced water-stop steel plate is in lap joint with the two first water-stop steel plates and is fixed to the two first water-stop steel plates in a