The invention relates to a solvent-free UV (Ultraviolet) brushing coating for a wooden door and a preparation method and a construction technology thereof. The solvent-free UV brushing coating for the wooden door adopts manual brushing coating and has the same effect with spraying, a utilization rate of a coating is 100 percent, no volatile matter is generated, the environment is not damaged, and the national environment protection requirements are met. The solvent-free UV brushing coating for the wooden door, provided by the invention, has the characteristics of high-leveling and quick-brushmark removing performance, high transparency, good adhesion, high hardness, easiness in polishing and the like, is suitable for manual UV bottoming and coating operation of small and medium-sized wooden door furniture factories, and is capable of greatly increasing the production benefit and reducing the coating cost.