The invention relates to a semitransparent Thai teak color raw umber air purification type polyurethane wood paint and a preparation method thereof. The polyurethane wood paint is composed of a component A and a component B in a weight ratio of 1:0.5. The component A consists of air purification type alkyd resin, matting powder, a dispersant, a Thai teak color paste, a leveling agent, a defoaming agent, an anti-settling agent, and a solvent. The component B is a benzene-free curing agent based on TDI, HDI trimer or adduct. The semitransparent Thai teak color raw umber air purification type polyurethane wood paint prepared by the invention does not contain aromatic hydrocarbon, aldehyde ketone or heavy metal, can reach the air purification effect after coating into a film, and during storage, has the characteristics of no precipitate, good leveling property, good hand feel, high scratch resistance, and no ghosting. After coating a wooden ware with the paint, the wood grains are clear and thorough, so that the furniture looks elegant and noble, plain and natural, gives people graceful and comfortable feel, and adapts to modern aesthetic view, thus being very popular with the market and customers. The semitransparent Thai teak color raw umber air purification type polyurethane wood paint provided by the invention is widely used for surface decoration and protection of wooden wares, metals, plastics and the like.