In the face of industry competition and environmental regulatory requirements，the world’s representative Iron & Steel companies insist on leading the technological development of the industry with the soft power of technological innovation. The research on representative Iron & Steel enterprises is beneficial to provide analytical framework and policy thinking for the improvement of technological innovation performance of world steel enterprises. This report conducts research on technological innovation efficiency based on panel data of 29 representative companies from 2015 to 2020. Construct the input and output evaluation index system of technological innovation efficiency of Iron&Steel enterprises，and use the input and output scores calculated by principal component analysis to measure the input and output of technological innovation. The DEA-Malquist index method combined with the Super-SBM model is used to describe the dynamic trend and static characteristics of the technological innovation efficiency of Iron&Steel enterprises；the technological innovation efficiency value obtained based on the Super-SBM model is used to measure the technological innovation level and rank，and a panel Tobit regression was constructed. The model explored the main factors affecting the technological innovation efficiency of Iron&Steel enterprises. The study found that 82.8% of enterprises’ technological innovation investment showed an upward trend. The average value of technological innovation efficiency of enterprises is above 0.9，89.7% of enterprises’ technological innovation efficiency showed a stable performance during the study period，and 10.3% showed a downward trend. The average difference in technological innovation efficiency among enterprises is not large. The current gross profit，the number of patents，etc. have a positive impact，while the proportion of R&D investment and firms’ assets have a negative impact on the efficiency of enterprises. Based on the conclusion of theoretical analysis，it is suggested that governments of countries actively build Iron &Steel technology innovation centers，enterprises introduce technology and continuously deepen reforms，and pay attention to the improvement of patent quality，so as to improve the technological innovation efficiency of Iron&Steel enterprises.