The utility model provides a portable bracing piece for GIS superfrequency partial discharge detector, relates to a non -conductive support rod. To the insulating basin of the inseparable GIS equipment of some structure, because the space is narrow and small, measurement personnel is difficult to get into and arranges the sensor. The utility model discloses a sensor seat, angle adjusting device, coupling mechanism and action bars, coupling mechanism includes that swing joint is first, fixed connection is first, is used for connecting swing joint head and the first connecting piece of fixed connection, the overhead first fluted disc that is equipped with the terminal surface and establishes the tooth of swing joint, the overhead second fluted disc that matches with first fluted disc that isequipped with of fixed connection, first fluted disc, second fluted disc set up relatively, and first fluted disc meshes the back with the second fluted disc and fixes through the connecting piece, the action bars is detachable the connection with coupling mechanism, the action bars be the telescopic action bars, it includes establishes the setting element by multi -section telescopic pole between the adjacent telescopic link. This technical scheme flexible operation, operator person can hang down the do -nothing operation, prevents the incident, reduces the operating risk.