In this paper the Finite Element Method (FEM) is applied to verify the reliability of the steel ladle turret while the steel ladle capacity was extended. The three-dimensional model of the ladle turret parts were constructed with the 3D digital modeling technology. The models of main subassembly that need to be checked were digitally assembled imitatively. The key forcing parts were FEM Meshed and analyzed the stress and the displacement. The verify check results show that the coefficient of safety of the equipment is large enough for the ladle capacity raised from 300t to 320t without changing the structure of ladle turret. It can meet the strength requirement after the ladle capacity was extended. The digital assembled model of the equipment can also be used for further digital mechanism analysis.