The invention discloses a direct current line double-splitting ground wire arrangement mode. A single-pole eight-splitting lead wire bundle, a first double-splitting ground wire bundle and a second double-splitting ground wire bundle are involved; the first double-splitting ground wire bundle and the second double-splitting ground wire bundle are located in one same plane; the first double-splitting ground wire bundle and the second double-splitting ground wire bundle both adopt two double-splitting ground wires of 210 mm<2>; the first double-splitting ground wire bundle and the second double-splitting ground wire bundle are symmetrically erected above the single-pole eight-splitting lead wire bundle; a perpendicular distance between lead wires and ground wires is not less than 23 m; a central horizontal distance between the ground wire bundles on two sides is 8+/-1 m; the above-mentioned two sizes meet the requirement that the protection angle of the ground wires for the lead wires is not greater than -10 degrees. The invention firstly provides a ground wire erection mode during single-pole arrangement of a +/-1,100 kV direct current power transmission line, so that the surface field strength of the ground wires is less than a limit value of 18 kV/cm, and the highest economy can be guaranteed.