The invention discloses a non-contact anti-induction voltage nuclear phase device for a power transmission line. The non-contact anti-induction voltage nuclear phase device comprises a detection device and a grounding wire, wherein a detected phase of the power transmission line is grounded by the grounding wire; the detection device module comprises a power supply, a DC/AC (Direct Current)/(Alternating Current) inverter, a signal processing unit, a buzzer, a first coil and a second coil; the power supply is separately and electrically connected with the DC/AC inverter and the signal processing unit; the buzzer is electrically connected with the signal processing unit; the DC/AC inverter is electrically connected with the first coil; the signal processing unit is electrically connected with the second coil; the first coil and the second coil separately sleeve the grounding wire. As the detected phase is possibly electrified by induced electricity of other electric high-voltage lines and inductive voltage of a detected line is high sometimes and brings great hazards to the nuclear phase device and persons. The device injects a voltage signal into the grounding wire, an electromagnetic induction signal is received by a signal processing unit, the hazards of highly-inductive voltage to equipment and operators are eliminated, and further the safety of the nuclear phase device and the operators is ensured.