As a major steel producer, the annual output of steel in China has reached 1.03 billion tons, ranking the highest amount over the world. Blast furnace gas/converter gas is the by-products of the blast furnace ironmaking industry, and its annual output is as high as ~1.8 trillion m3. Therefore, the realizing the clean and efficient utilization of blast furnace gas/converter gas is a major demand for the sustainable development. At present, the integrated utilization of blast furnace gas and converter gas by iron and steel companies mainly includes: one part is directly used as fuel for boilers, hot blast stoves, heating furnaces, etc.; The other part is to use the residual pressure of blast furnace gas to generate electricity, and then use the blast furnace gas as fuel for boilers, hot blast furnaces, and heating furnaces. With the continuous improvement of energy structure and environmental protection requirements in China, the integrated utilization of blast furnace gas/converter gas, purification and proportioning according to the raw material process requirements of industrial synthetic ammonia to produce green hydrogen, which is used as the raw feedstocks for synthetic ammonia. It can not only meet the demand of regional economic development for green synthetic ammonia production, but also realize the reorganization of blast furnace gas/converter gas resources. As a result, the new technique promotes the green development of the regional economy, which meets the current national requirements for energy saving and emission reduction for ammonia synthesis and the steel industry. Based on this, this review systematically analyzes and forecasts the low-carbon and high-efficiency ammonia synthesis process from blast furnace gas/converter gas and demonstrates the advantages of the developed technique.