Through-wall porcelain bushing with large and small porcelain columns

The utility model relates to the field of the electrotechnical porcelain electric appliance production technology, more particularly to a through-wall porcelain bushing with large and small porcelain columns. The through-wall porcelain bushing comprises porcelain columns at the two ends and a flange in the middle. Specifically, the porcelain columns at the two ends are a thick porcelain column and a thin porcelain column; the thick porcelain column has the thick wall and the long length; and the thin porcelain column has the thin wall and the short length. Therefore, the provided through-wall porcelain bushing has advantages of low cost and the capability of meeting the using requirement.