The invention relates to a preparation method of perfluoropolyether modified allyl oxygen matrix. The method concretely comprises the step of enabling perfluoropolyether acyl fluoride and an allyl compound to be subjected to a reaction in presence of a phase transfer catalyst Y, fluoride salt MF and a non-protonic solvent so as to obtain the perfluoropolyether modified allyl oxygen matrix. The preparation method provided by the invention simplifies the manufacturing process, is high in raw material utilization rate, enables the product not to be easily hydrolyzed, omits the step of chromatographic column purification, reduces the cost, has the yield reaching up to 94.7%, and is beneficial to mass production, thus having higher application value.