Through research on the use of ladle cover,the development of automatic cover device,to solve the steel making production is difficult to achieve fully automatic cover.According to requirements of motion trajectory of ladle cover,achieving whole proposal of ladle transporting positioning,slag dumping and hot repair by 3D and ADAMS simulation.The simulation results show that the automatic capping device satisfy motion trajectory of ladle cover and special requirements,and the automatic capping device is developed,which provides a strong support for realizing intelligent steel making.