Preparation process of medium-strength anti-corrosion high-magnesium aluminum alloy plate

The invention discloses a preparation process of a medium-strength anti-corrosion high-magnesium aluminum alloy plate and belongs to the technical field of aluminum alloy machining. The preparation process of the medium-strength anti-corrosion high-magnesium aluminum alloy plate comprises batching, smelting, degassing and filtering, casting, homogenizing annealing, saw cutting and milling, preheating, hot rolling, edge-cutting or cross-cutting uncoiling, drawing and saw cutting, wherein the drawing refers to performing edge-cutting processing on the plate after natural cooling and then drawing the plate on a drawing machine by the drawing amount of 3-7%. Compared with a high-magnesium aluminum alloy plate prepared by use of a traditional cold rolling method, the preparation process is capable of breaking through the limitation of the opening degree of a cold-rolling mill and producing a thick plate; the obtained plate is high in straightness, low in internal stress, even in cold deformation and excellent in corrosion property.