The utility model relates to a high -pressure wall bushing of three element structures sets up ground connection side accessory system in wall bushing ground connection side, and the electrode side sets up electrode side accessory system. The ground connection side accessory system comprise insulation part and current -carrying part, insulation part and current -carrying part in close contact with, electrode side accessory system adopts insulating material. Ground connection side accessory system's current -carrying part touches with the ground connection side joint, insulation part and current -carrying part contact. Electrode side accessory system's insulating material touches with the electrode side joint. Ground connection side accessory system has weakened near the electric field strength in flange, has improved corona pickup voltage, has increaseed the diameter and the thickness that are close to the full skirt of flange, is equivalent to that the electric capacity on surface has reduced, has improved flashover voltage, can guide discharge charge's movement track, block discharge charge's diffusion, prolong the discharge path of flashover, improve dry flashover voltage, restrain pollution flashover, improved wet flashover voltage, the utility model discloses also be applicable to the wall bushing of all other types.