Magnesium aluminum composite plate is an aluminum–magnesium–aluminum sandwich composite plate formed by covering a layer of aluminum on the surface of magnesium alloy. Compared with magnesium alloy, the corrosion resistance of composite plate has been effectively improved and the forming ability has been significantly improved. This paper summarizes the preparation methods and forming processes of magnesium aluminum composite plate. It introduces the research progress of different preparation methods of magnesium aluminum composite plate, compares and analyzes the advantages and disadvantages of different preparation methods. It analyzes the shortcomings of the existing forming methods of magnesium aluminum composite plate structure, and puts forward the corresponding solutions, so as to provide reference for the application of magnesium aluminum composite plate structure in the field of aviation and aerospace.