Hot-galvanized aluminum-magnesium alloy steel plate and production process thereof

The invention discloses a hot-galvanized aluminum-magnesium alloy steel plate and a production process thereof. The hot-galvanized aluminum-magnesium alloy steel plate comprises a steel plate body anda plating layer on the surface of the steel plate body. The plating layer comprises the following components of aluminum, magnesium, cerium, lanthanum, antimony and zinc. A zinc ingot is placed in azinc pot to be heated and molten; a magnesium-zinc alloy ingot, an aluminum-zinc alloy ingot and rare earth are placed in, sampling is carried out after melting, a sample is subjected to spectral analysis, various chemical components are measured, the zinc ingot, the magnesium-zinc alloy ingot, the aluminum-zinc alloy ingot and the rare earth continue to be added according to the actual contents of the components, uniform stirring is carried out, and then spectral analysis of the sample is carried out till the content requirement of the components is met; the steel plate body is subjected to finishing, and then the fro