The invention discloses a deep-buried PBA subway station enclosing side pile. The pile comprises an enclosing pile body, a ground stabilizing foundation and a foundation connecting piece, wherein theenclosing pile body is deeply buried in a borehole, adopts a concrete side pile, and comprises a pile column steel structure and concrete, the pile column steel structure comprises a main rib, an auxiliary rib, an upper half pile steel ring and a lower half pile steel ring, the ground stabilizing foundation is arranged at the upper end of the main rib and the upper end of the auxiliary rib, and the foundation connecting piece is used for connecting ground stabilizing foundations. According to the pile, the upper half part of the side pile is fixed by the steel ring with the larger diameter, sothat the shear strength of the upper half part of the side pile is higher than the shear strength of the lower half part of the side pile, the large horizontal load is balanced, the horizontal load of the enclosing side pile can be improved at the low cost, and the pile is suitable for large-scale popularization.