Accurating calculation of the carbon emissions implied in the global trade of iron-containing commodities not only allows more equitable and efficient allocation of carbon emissions responsibilities, but also provides information for allocating emission allowances in various regions. In this paper, the carbon emission factors of steel products of various countries were separately verified. The CO2 emissions implied in the international trade of iron-containing commodities in 2015 were calculated in combination with the methods provided in the “IPCC National Greenhouse Gas Emission Inventory 2006.” The calculated results show that: ① From the perspective of the continent, due to geographical location, transportation costs and other factors, the amount of hidden carbon emissions in the continent is relatively large, the flow between continents accounting for about 63.83% of the total flow; In Asia and Europe, the amount of implied carbon emissions from iron-containing commodities exported at the back end of the industrial chain is relatively large, which is related to the industry mode of “imported raw materials and export products.”; North America, Africa, Oceania, and South America have transferred carbon emission responsibility to Asia and Europe through iron-containing commodity trade; ② from the national level, United States, Mexico, Vietnam, etc. have transferred their carbon emission responsibilities to China, Russia, Japan, etc.. Among them, the United States, Vietnam, South Korea and other countries have transferred a large number of carbon emission responsibilities to China, which are 38.5 million tons, 33.9 million tons, and 29.2 million tons. In this paper, the calculation of the implied carbon emissions of iron-containing commodities in the world can more accurately and effectively divide the international carbon emission responsibility and provide technical support for the allocation of carbon emission quotas between countries.