The invention relates to an unsaturated oxime ether compound (I) preparation method, wherein the reaction formula is defined in the specification, and each group in the formula is defined in the specification. According to the present invention, with the method, styryl methyl ketone oxime (II) and bromo oxime ether (III) are subjected to a reaction in a ketone solvent by using a carbonate as an alkali to prepare a high-yield oxime ether compound (IV), and further the unsaturated oxime ether compound (I) is prepared through aminolysis under the action of methylamine.