The invention relates to a flame-retardant anti-fouling water-based paint for woodware, and a preparation method thereof The water-based paint is prepared from, by weight, 40-60 parts of a water-basedhydroxyl polyacrylate emulsion, 10-15 parts of organic fluorine resin, 1-6 parts of a cross-linking agent, 2-4 parts of modified rice hull ash, 0.5-2 part of fumed silica, 3-8 parts of functionalizedgraphene modified montmorillonite, 0.1-0.5 part of an antifoaming agent, 1-6 parts of a coalescing agent, 0.4-1 part of a thickener, 0.3-1.2 parts of a leveling agent, 0.01-0.1 part of a fluorocarbonactivator, 0.1-1 part of a mildew-proof bactericide and 15-25 parts of deionized water. Compared with paints in the prior art, the water-based paint disclosed by the invention has the advantages of strong adhesive force to wood products, and good flame-retardant and heat-insulating effects, and apaint film of the paint has the advantages of high hardness, good abrasion resistance, good weather resistance, good fullness and distinctness of image, good stain resistance, easiness in construction, no pollution to environment and human bodies, no toxicity and no harm, and is green and environment-friendly.