The invention discloses a Zn-Al-Mg hot-dip steel plate with high
corrosion resistance, and a production method thereof. The Zn-Al-Mg hot-dip steel plate comprises a baseplate and a
coating on the baseplate, and is characterized in that the chemical components of the
coating comprise, by
mass, 1.8%-2.3% of Al, 1.2%-1.8% of Mg, 0.01%-0.08% of Re, 0.003%-0.008% of Cu and the balance Zn and other inevitable impurities, wherein the Cu is added to plating solutions in a nanometer form during melting of the plating solutions. The Cu in the
coating of the steel plate is added in a nano-
copper form during melting of the plating solutions; since the temperature of Zn liquid is lower during adding of the Cu, the shape of Cu particles can be ensured; by taking
advantage of the characteristic of
fine dispersion of the Cu particles, the Cu particles play a role in strengthening of
precipitation, so that the
hardness of the coating is improved; and by adding of
rare earth Re, the coating structure can be fined, and the fluidity of the plating solutions is improved, so that the
corrosion resistance of the coating can be improved effectively. The coating structure of a product obtained with the method is primary Zn, Zn / MgZn2 binary eutectic, Zn / Al / MgZn2
ternary eutectic and nano-
copper; and the
corrosion resistance is equal to 10-15 times the corrosion resistance of a pure
zinc plate of the same thickness.