The invention relates to a special 2K acrylic polyurethane metal glittering primer coating for interior and exterior decorations of urban rail vehicles and locomotives, and a preparation method thereof. The coating comprises a main body coating and an auxiliary coating; and the main body coating comprises low-hydroxyl acrylic resin, a metal pigment, an assistant and a mixed solvent, and the auxiliary coating includes aliphatic isocyanate and a mixed solvent. The coating is constructed in a double-coating spray manner, and then is baked or naturally dried and solidified to form a film. The coating is mainly used in the body and the interior decorations of the urban rail vehicles and locomotives, can improve the level of the urban rail vehicles and locomotives and create noble, beautiful andrich decorative effects, makes a coating layer have a prolonged life and excellent resistance to wear and scratches, and is suitable for coating the exterior decorations of the urban rail vehicles, such as vehicle bodies, ribbons and patterns and interior decorations, such as operating consoles, door armrests and luggage racks.