The CO₂ emission reduction potential of hydrogen in several processes of iron-making, such as hydrogen blast furnace injection and hydrogen reduced iron, is analyzed. The results show that hydrogen injection into the blast furnace can reduce CO₂ emission with a maximum potential of 21.4%, but the hydrogen consumption per ton of iron is more than 700 m³; coke oven gas injection into the blast furnace can reduce the amount of pulverized coal blowing, which has a certain energy-saving effect, and 50 m³ of coke oven gas can directly reduce 59.4 kg of CO₂ and a combined emission reduction of 20 kg of CO₂; natural gas blowing can replace pulverized coal for blowing, and the relationship between direct carbon reduction and natural gas blowing is 1.3 kg/m³ natural gas, which achieves a certain emission reduction effect, but China has few natural gas resources and high prices, which seriously affects the economics of implementation; coke oven gas produces direct reduced iron, the consumption of iron per ton is 600 m³, and when the coke oven gas produced by the independent coking plant is fully used to produce direct reduced iron, the iron per ton can reduce CO₂ emissions by 78.8%. The pure hydrogen reduction iron-making process consumes 800 m³ of pure hydrogen per ton of iron metal, and the electricity consumption for hydrogen production through green electricity and electrolytic water reaches 4000 kW·h per ton of steel, and taking into account melting and various other electricity consumptions, the total electricity consumption reaches 4800 kW·h per ton of steel, which is much higher than the electricity for scrap melting.