The nexus between water and energy in iron and steel enterprise was studied from the view of energy consumption of water usage in iron and steel production. And then the concept of water energy intensity was put forward to evaluate the energysaving level of water resources utilization in the production process of enterprises, and the waterenergy nexus model of iron and steel enterprise was established. Taking a large iron and steel enterprise in China as an example, the relationship between water and energy was calculated and analyzed. The total waterenergy quantity of the enterprise was 55 709 kW·h/h, the energy of the reused water consumption accounted for 82% of the total water energy of the whole steel enterprise, the energy of hydration water accounted for 16%, and the drainage water energy only accounted for 1%. Hot rolling process accounted for the largest proportion of all processes, followed by ironmaking and steelmaking, and cold rolling, sintering and coking processes were the lowest. The waterenergy intensity per ton of steel was 0.208 kW·h/m3, and the waterenergy intensity of the ironmaking process was the highest, followed by hot rolling and steelmaking, and the sintering, cold rolling and coking processes were the lowest. Finally, the direction and measures for energy saving were obtained from the perspective of water resources utilization in iron and steel production.