The invention provides a preparation method of unsaturated alcohol. The preparation method comprises the following steps: uniformly mixing unsaturated halogenated hydrocarbon, water, a catalyst and a non-polar organic solvent, adding an alkaline solution, adjusting the pH value to be 5-8, reacting at 20-150 DEG C, and purifying to obtain unsaturated alcohol. The method provided by the invention is simple in process, mild in condition, relatively less in three-waste emission, high in yield, and convenient in purification and separation of products.