The invention discloses a copper deoxidizing agent and belongs to the technical field of low-oxygen copper rod production with reclaimed copper. The copper deoxidizing agent comprises, by mass percentage, 15%-25% of phosphorus powder and 75%-85% of charcoal powder. The copper deoxidizing agent has the advantages that the defect that contacting area is small because traditional poling mainly depends on C\H reduction is overcome; primary reduction is generated through CH to generate CO and reduction is continued, deoxidizing reduction efficiency is high, only a little waste gas is exhausted, the operation is simple, labor cost is low, and raw material cost is greatly reduced; compared with a traditional method, the deoxidizing agent provided by the invention has the beneficial effects that reduction time is shortened by 70% or more, producing cost is reduced by 50% or more, and meanwhile, exhaust gas discharge is reduced by 60% or more, so that the environmental pollution is greatly reduced.