As a kind of novel magnetic-controlled intelligent material,the magnetic liquid (magnetic fluid/magnetorheological fluid) combines the fluidity of liquid and magnetic response characteristics of solid magnetic material,which can realize the reversible transverse between them under external magnetic field.Magnetic fluids have attracted extensive attention due to their unique properties such as zero leakage and self-healing,especially as promising candidate material for advanced aerospace equipment.To discuss the application of magnetic fluid in aerospace equipment,focusing on the harsh cosmic environment,severe challenges faced by the aerospace devices including vacuum,radiation and thermal cycling were analyzed,and technique progress of magnetic fluid lubrication and seal applied in space devices in the past were reviewed.Both limitations of the prevail development and problems urging to be solved in future around the development of advanced lubrication/sealing devices for deep universal space were proposed.