The invention discloses a method for longitudinal zero-sequence power direction protection of a double circuit line on a same pole, which comprises an own-side zero-sequence power direction criterion and an opposite-side zero-sequence power direction criterion, and the own-side zero-sequence power direction criterion is shown by a formula (I) while the opposite-side zero-sequence power direction criterion is shown by a formula (II), wherein 3I0M and 3I0N are zero-sequence currents of an M side and an N side of one loop, 3I0M' and 3I0N' are the zero-sequence currents of an M side and an N side of the other loop, 3UM0 and 3UN0 are bus zero-sequence voltages of an M side and an N side at a protective mounting part, Arg shows a subsequent phasor phase-taking angle, and K is a zero-sequence mutual inductance influence coefficient. By using the AND gate outputs of the two criterions, when the two formulae are satisfied at the same time, ground faults can be determined to appear in a protected area, and the criterions of the longitudinal zero-sequence power direction protection are acted.