The utility model provides a special high voltage direct current wall bushing subassembly, including sleeve pipe body, coaxial setting at the equalizer ring at sleeve pipe body both ends and set up the insulating coating on the sleeve pipe outer wall, the equalizer ring is the multi -curvature equalizer ring, the insulating coating is the zigzag insulating coating. One end that a shielding section of thick bamboo and a transition section of thick bamboo are connected is held for the slot for wide mouthful of end, the one end of keeping away from transition tin, wide mouthful of end of a shielding section of thick bamboo is connected with a flange and a transition section of thick bamboo, the slot end of a shielding section of thick bamboo and the outer wall sealing connection of electrically conductive barrel subassembly. The utility model provides a subassembly is applicable to the contact tube of various length, and it has optimized sheathed tube cantilever load, has reduced the holistic deformation of dangling for holistic field distribution is more even for the sleeve pipe, has reduced simultaneously and the electric field pointed end, has improved reliability and the life of direct current wall bushing in the electric field.