The utility model discloses a four-split conductor structure for a 750 kV substation bus. The four-split conductor structure includes four split conductors with the split distance between conductors being 400 mm and the diameter of a single conductor no smaller than 51 mm. With the use of the conductor structure, the phenomenon of corona discharge is significantly improved; the corona noise is generally below 45 dB with a 25% decrease. The four-split conductor structure has good economic benefit and provides important reference for subsequent extra-high voltage power transmission projects. Meanwhile, the four-split conductor structure after optimization also reduces environmental pollution because corona discharge is eliminated during the operation.