Underground supporting and anchoring equipment and method for building construction

The building construction underground supporting and anchoring equipment comprises a prefabricated pipe, the prefabricated pipe penetrates through the side wall of a foundation pit, a limiting mechanism is arranged on the left side of the prefabricated pipe, and the limiting mechanism comprises a top plate, a reinforcing plate and a positioning plate. A sealing sleeve and a limiting strip can limit the two ends of a guide pipe correspondingly, the mounting position of the guide pipe can be limited, an auxiliary strip and an annular pipe can assist in position adjustment of a supporting strip, the pouring area in a foundation pit is increased, adjustment of a first supporting rod can be guided through a top plate and a guide plate, and the construction efficiency is improved. The contact area of the side wall of the foundation pit is increased through the positioning plate and the inserting rod, the supporting effect can be improved, deformation of the foundation pit can be reduced, meanwhile ...