The utility model discloses a transformer substation's wall bushing subassembly for pass the sleeve pipe opening that sets up on the wall body, transformer substation's wall bushing subassembly includes: the frame, this frame matches with this opening, the sealed pad, sealed pad is located between frame and the open -ended hole wall, mounting panel, this mounting panel adopt the stainless steel material preparation, and this mounting panel is edge -fixed on the frame, and this sleeve pipe passes and fixes on this mounting panel from the middle part of this mounting panel. The utility model hasthe advantages that: better production of having stopped the drainage.