Low-VOC (volatile organic compound) coating applied to magnesium-lithium membrane and preparation method of low-VOC coating

The invention discloses a low-VOC (volatile organic compound) coating applied to a magnesium-lithium membrane and a preparation method of the low-VOC coating. A primer of the low-VOC coating comprises the following components: 25-35 parts of epoxy resin, 1.5-2 parts of a dispersing agent, 25-40 parts of a mixed solvent, 3-5 parts of a black pigment, 2-3 parts of an anti-settling agent, 0.02-0.04 part of a drier, 0.2-0.5 part of a wetting agent, 2-3 parts of an adhesion promoter, 20-25 parts of filler, 2-2.5 parts of matting powder and 3-5 parts of a water-resistant and salt-fog-resistant auxiliary agent. 15-20 parts of a curing agent; the finish paint is prepared from 55 to 65 parts of polyurethane resin, 2 to 5 parts of dispersing agent, 15 to 20 parts of butyl acetate, 3 to 5 parts of black pigment, 2 to 3 parts of anti-settling agent, 0.3 to 0.4 part of wetting agent, 3 to 5 parts of wax powder, 4 to 5 parts of matting powder, 0.1 to 0.2 part of flatting agent and 15 to 20 parts of curing agent; the invent