The invention discloses a lead skim reducing process, comprising the following steps: adding flux and fused lead skim into the hearth of a lead skim reducing furnace; heating the materials in the hearth by utilizing an electrode; spraying powder coal into the furnace from the bottom of the lead skim reducing furnace; and respectively discharging rough lead, waste slag and smoke from a lead discharging port, a slag tap and a smoke outlet. The reducing process of the invention has small needed powder coal amount, small smoke amount, low soot rate, high lead recovery rate and low cost.