The invention discloses a full-automatic parking garage body structure at a shallow underground layer. A garage body space is formed by external walls, a top plate and a bottom plate in a defined mode. A plurality of prefabricated piles are arranged along the outer edges of the external walls. The external walls are tangent with the surfaces of the prefabricated piles. The top plate and the bottom plate are supported through steel frames in a garage body and divided into a plurality of parking places through the steel frames in the garage body. The full-automatic parking garage body structure at the shallow underground layer has the advantages that a prefabricated pile support system is adopted as an enclosure system, a static pressure pile sinking method is adopted for construction, earthwork can be excavated without site maintenance after construction is finished, and the construction period can be shortened compared with a traditional site wet operation construction method; the prefabricated piles become one part of a permanent structure, and the piles and the walls are combined into one; the internal steel frames serve as a permanent bearing structure and tool members of the conduction period; by means of the internal fabricated members, the space utilization rate of a garage is increased, and the construction period is shortened.