Soil anchor is called soil anchor for short. It is to drill holes in the unearthed soil layer of deep foundation soil wall. After reaching a certain depth, steel bars, steel pipes, steel wire bundles, steel strands and other materials are put into the holes, and mud or chemical slurry is poured into them to combine with the soil layer to form an anchor with strong tensile (pull-out) strength. The end of the anchor rod is connected with the retaining pile to prevent the soil wall from collapsing or landslide. Because there is no support in the pit, the construction conditions are good.