The utility model provides an experimental universal adapter of 220kV SF 6 circuit breaker. The utility model relates to an experimental universal adapter of 220kV SF 6 circuit breaker is specifically waded to the circuit breaker attach fitting. The utility model discloses a joint of solving current dew point hygrometer or density relay check gauge and circuit breaker tube coupling used is many, dismantles the problem that takes time. An experimental universal adapter of 220kV SF 6 circuit breaker includes top connection end, interior sleeve pipe, connecting pipe and end -to -end connection end, the end is connected at top, interior sleeve pipe, connecting pipe and end -to -end connection end are by preceding after to rigid coupling in proper order, interior sheathed tube one end cartridge is in the inside of the first end of top link, interior sheathed tube other end cartridge is in the inside of connecting pipe one end, be equipped with the internal thread on the interior circumference lateral wall of the top connection end other end, be equipped with the external screw thread on the terminal outer circumference lateral wall of end -to -end connection end, interior sleeve pipe, the inside gas circuit passageway of constituteing of connecting pipe and end -to -end connection end. The utility model is used for the connection of circuit breaker.