Magnesium-aluminum alloy composite material and preparation process thereof

The invention discloses a magnesium-aluminum alloy composite material and a preparation process thereof. The preparation process comprises the following steps that S1, materials are prepared, specifically, the surfaces of a prepared composite magnesium alloy plate, an aluminum alloy plate and auxiliary materials are cleaned, and it is guaranteed that the surfaces of the materials are free of oxide, oil dirt and impurities; S2, the materials subjected to surface treatment are stacked, auxiliary materials are located between the magnesium alloy plate and the aluminum alloy plate, and simple composite fixing is conducted; S3, the materials are put into a furnace to be preheated to melt the auxiliary materials, and then multiple times of hot rolling compounding are conducted till the materials reach a target thickness; and S4, after rolling is completed, thermal diffusion annealing treatment is conducted. After the auxiliary materials with a lower melting point is preheated and melted, the auxiliary materials are