The invention discloses a double-circuit line non-same-name-phase overline grounded reactance distance protection method. The method includes the steps that firstly, the fault phase voltage, the fault phase current and the zero-sequence current of a protecting and installing position of a circuit line I of a double-circuit line are measured; the zero-sequence current of a circuit line II of the double-circuit line is calculated, and the voltage phase angle of a grounded fault point of the circuit line I is estimated by using the phase angle of the sum of the zero-sequence current of the circuit line I and the zero-sequence current of the circuit line II; whether the conclusion that the phase angle of the voltage, ahead of the voltage of the grounded fault point of the circuit line I , in the protecting and setting range of the circuit line I is within the range from minus 165 degrees to 15 degrees is established or not, and if yes, a protecting device sends an actuation signal for tripping. Only single-end single-circuit line electric amount is used, motion performance is not affected by operation modes of an electric power system, the influence on motion performance of an on-the same-tower double-circuit line non-same-name-phase overline grounded reactance distance relay by zero-sequence mutual inductance between the lines, transition resistance and a load current is eliminated, and the protecting range is stable and reliable.