Abstract: Mg/steel dissimilar metals joining structures can achieve structural lightweight, energy savings and emission reduction, which shows vast potential for application in fields such as aviation, automobile. However, due to the significant differences in physical properties between magnesium and steel, as well as the poor metallurgical compatibility between Mg and Fe elements-which cannot form solid solutions or compounds, it is difficult to achieve good welding between magnesium and steel. Starting from the weldability of Mg/steel, the current research status of brazing, friction stir welding, diffusion welding, and spot welding in the welding of Mg/steel dissimilar materials was elaborated. It pointed out the advantages and disadvantages of various methods and future research directions for the welding of Mg/steel dissimilar metals were prospected.