The utility model discloses an insulation is tested denso and is established earth connection auxiliary rod, it includes insulator spindle, electroscope head, gets in touch head and insulating sheath, electroscope head and couple head, the fixed insulating sheath that is equipped with of the other end are connected to insulator spindle one end, the electroscope head with the couple head is connected on the insulator spindle, can change each other and install and remove, the insulator spindle is the telescopic structure, and the one end of just connecting electroscope head and couple head is fixed with a nut, the one end of electroscope head is equipped with the screw thread, the one end of couple head is equipped with the screw thread. Use this insulation is tested denso and is established earth connection auxiliary rod operation personnel large deflection strain insulator shaft tower with insulating sheath's shaft tower is equipped with on install the earth connection, only need carry insulation is tested denso and is established earth connection auxiliary rod, reduced intensity of labour, installation electroscope head carries out the circuit and tests the electricity, more changes the couple head into and installs the earth connection, has improved work efficiency, make things convenient for the staff to carry, guaranteed staff's personal safety.