本发明公开了一种热浸镀锌铝镁镀液及其热浸镀后的钢板及钢板的制备方法。所述热浸镀锌铝镁镀层钢板，包括基板和镀层，形成所述镀层的镀液包括以下化学成分及重量百分比：Al：2～5％ ，Mg ：1～3％ ，Ti ：0 .01～0 .05％ ，Fe ：≤0 .02，Cd：≤0 .002％，Cr：≤0 .002％其余为Zn和不可避免的杂质。基板经脱脂、漂洗、烘干连续退火处理后进行热镀锌，得到一种新型高表面质量和高耐蚀的镀层钢板。

The invention discloses a hot-dipping zinc-aluminum-magnesium plating solution, a hot-dipped steel plate and a preparation method of the steel plate. The hot-dipping zinc-aluminum-magnesium plated steel plate comprises a base plate and a plating layer, wherein a plating solution forming the plating layer is prepared from the following chemical components by weight percent: 2 to 5 percent of Al, 1to 3 percent of Mg, 0.01 to 0.05 percent of Ti, less than or equal to 0.02 percent of Fe, less than or equal to 0.002 percent of Cd, less than or equal to 0.002 percent of Cr and the balance of Zn andunavoidable impurities. The base plate is degreased, rinsed, dried, and continuously annealed and hot galvanized, and the novel plated steel plate with high surface quality and high corrosion resistance can be obtained.