Anchoring support utilizing shallow foundation pit in pit with large height difference and foundation pit construction method

The invention discloses an anchoring support utilizing a shallow foundation pit in a large-height-difference pit and a foundation pit construction method. The anchoring support comprises a retaining assembly, a force transmission assembly and an anchoring support assembly. The supporting and retaining assembly comprises a plurality of steel sheet piles, namely steel enclosing purlins arranged at the upper ends of the steel sheet piles. The force transmission assembly comprises anchoring steel bars corresponding to all the steel sheet piles. One end of each anchoring steel bar penetrates through the corresponding steel sheet pile and the corresponding steel enclosing purlin and is restrained on the inner side of the steel enclosing purlin, and the other end of each anchoring steel bar is anchored on a reinforced concrete bottom plate of the shallow foundation pit; tensile steel bars are symmetrically and uniformly distributed on the two sides of each anchoring steel bar at the construction seam edge of the rei