The utility model discloses a connection structure of an ultra-high-voltage converter station metal loop isolation switch, comprising a metal loop isolation switch, a metal loop pillar insulator, an oblique supporting tubular bus, a horizontal tubular bus, a first connection fitting and a second connection fitting. The horizontal tubular bus is supported by the metal loop pillar insulator and has a center height of seven meters. The wiring terminal of the metal loop isolation switch is 16 meters above ground. One end of the oblique supporting tubular bus is connected with the horizontal tubular bus through the first connection fitting, and the other end is connected with the wiring terminal of the metal loop isolation switch through the second connection fitting. By designing the two fittings, one oblique supporting tubular bus replaces a complex wire height transition scheme in the prior art, the line is simple and reliable, and the height of a pillar insulator bracket is significantly reduced. Therefore, wiring is simple and clean, the project investment is saved, and the reliability and the aesthetic degree of the whole wiring are improved.