The invention discloses a preparation method for an aluminum-based metal glass coating controllable in component. Compared with the prior art, an aluminum-based metal alloy serves as a basis material,the metal glass coating (MGs) coating is obtained on the surface of the aluminum-based metal through a pulse discharging treatment method (PED), and the coating has extremely high hardness and extremely high acidic corrosion resistant capacity. The process and a traditional metal preparation process are good in integrating degree, and commercial production can be achieved very easily.