Supporting beam type support changing structure in deep foundation pit

The utility model discloses a deep foundation pit inner supporting beam type support changing structure which comprises an outer wall and a supporting pile arranged with the outer wall in a spaced mode, and the outer wall and the supporting pile are connected through a force transmission belt. The structure beams are arranged on the sides, close to the support piles, of the floor slabs, and the structure beams are connected with the support piles through support changing beams; the bottom plate is provided with a post-cast strip, a connecting piece is arranged in the post-cast strip, and the connecting piece is connected with the two opposite sides of the post-cast strip to reinforce the bottom plate. The structural beam and the support pile are connected through the support changing beam, support and transmission of force are achieved, and the situation that the lower portion of the support pile and the lower portion of the structural beam are in a vertical cantilever state is avoided. Meanwhile, the connect