The invention discloses a power network and a wiring method thereof. The power network comprises a plurality of power switch units which are arranged on a first semiconductor layer, and the power switch units are arranged in rows in the first direction, and are arranged in lines in the second direction. Each power switch unit in an even number of lines is aligned to a center point of a horizontalinterval of the corresponding two adjacent power switch units in an odd number of lines in the first direction. Each power switch unit in an even number of rows is aligned to a center point of a vertical interval of the corresponding two adjacent power switch units in an odd number of rows. The power network further comprises a plurality of second connecting wires which are arranged on a fourth semiconductor layer and extend along the second direction, the second connecting wires are arranged by taking a width in the power switch units as an interval, wherein the upper edge and the lower edgeof each power switch unit are separately connected with the two corresponding adjacent second connecting wires, and the first semiconductor layer is intersected with the fourth semiconductor layer.