Abstract: Aiming at the common industry problems of conservative selection, redundant wiring and unreasonable transformer outlet of traditional double-layer copper busbar for polysilicon reduction power supply, which lead to large copper consumption and high supporting equipment cost, an integrated lightweight wiring optimization scheme is proposed. Taking two mainstream types of reduction furnace power supply complete sets in the industry as research objects, collaborative optimization is carried out from four dimensions: accurate matching of current carrying margin, single-layer copper bar replacing double parallel bars, diagonal bending wiring and reconstruction of transformer low-voltage outlet structure. The electrical safety and economy of the scheme are verified through standard working condition current check, multi-base same-condition benchmarking and comparison of complete set material weight. The results show that the current carrying margin of each power branch after optimization maintains the industry safety range, which fully meets the long-term steady-state operation and short-term impact load requirements of the reduction furnace. The copper consumption of a single set of equipment is significantly reduced, and it has obvious weight reduction advantage compared with the traditional double-layer scheme under the same plant layout, and the supporting investment of complete power supply is greatly reduced. The four-dimensional collaborative lightweight wiring scheme proposed in this paper does not need to replace core converter equipment such as transformers and rectifiers, with low transformation threshold. It can be directly applied to the complete design of new polysilicon production lines and the upgrading of existing equipment, and provides a general design idea for lightweight engineering transformation of high-current DC busbars.