The utility model relates to a tip seal structure of special high voltage direct current wall bushing to the relatively poor problem of sliding seal effect between the conducting rod of the wall bushing among the solution prior art and the flange of sleeve pipe tip. Tip seal structure including have the sleeve pipe that holds the chamber, closing cap the flange of sleeve pipe tip and with the conducting rod of the coaxial setting of sleeve pipe, the conducting rod has conducting rod that conducting rod from the flange wore out in perforating and wears out the section, is equipped with stretching device on one side of flange's the sheathed tube dorsad, last being equipped with of flange covers stretching device with the sealed cowling of section, sealed cowling and the sealed cooperation offlange are worn out to the conducting rod. The sealed cowling is the static seal with flange, and seal structure is simple, and the sealing reliability is high, easily realizes, even the seal structure between conducting rod and the flange became invalid, also can effectively avoid insulating medium to reveal, compares with prior art and to realize better sealed effect.