Multicomponent alloy composite anticorrosive coating for metal pipe/pipe fitting

The invention discloses a multicomponent alloy composite anticorrosive coating for a metal pipe/pipe fitting, which comprises a Zn-Al-Mg-RE multicomponent alloy layer and a hole-sealing finishing layer, wherein the hole-sealing finishing layer is coated on the surface of the Zn-Al-Mg-RE multicomponent alloy layer, the Zn-Al-Mg-RE multicomponent alloy layer comprises the following components by weight percentage: 56-83% of Zn, 16-41% of Al, 0.05-2.0% of Mg and 0.05-1.0% of Re, and the hole sealing finishing layer is an organic or inorganic coating layer. The multicomponent alloy composite anticorrosive coating disclosed by the invention has the advantages of low porosity, good anticorrosive property and the like.