The invention discloses a zinc ash reducing agent for hot-dip galvanizing and belongs to the technical field of zinc ash recycling in hot-dip galvanizing production. The zinc ash reducing agent comprises the following components in percentage: 3%-8% of AlCl3.6H2O, 12%-20% of pulverized coal, 0-5% of NH4Cl, 5%-8%ZnCl2, 50%- 60% of fluorite powder, 10%-15% of NaCl, and 3%-5% of KCl. The zinc ash reducing agent is applied to zinc ash reduction recycle in the field of hot-dip galvanizing, the addition amount of the zinc ash reducing agent accounts for 0.2%-1% of the mass of zinc ashes in a furnace, and if the zinc ash reducing agent is used for processing the zinc ashes at 470-520 DEG C, the processing time needs to be not less than 40-60min. The zinc ash reducing agent has the functions of reducing, refining and covering and high zinc ash recovery rate.