Belonging to the technical field of fine chemical engineering, the invention relates to a synthesis method of allyl alcohol polyoxyethylene ether glycidyl carboxylate. The method includes: taking allyl alcohol polyoxyethylene ether carboxylic acid and epichlorohydrin as the raw materials to prepare allyl alcohol polyoxyethylene ether carboxylate in the presence of alkali, then under the protectionof nitrogen, carrying out reaction with epichlorohydrin for a period of time, performing filtering to remove salt, then conducting reduced pressure distillation and recovering epichlorohydrin, performing cooling to room temperature, adding a neutralizer for neutralization, then adding an adsorbent, and performing refining to obtain a qualified product. The synthesis method provided by the invention can be applied to synthesis of allyl alcohol polyoxyethylene ether glycidyl carboxylate, has the characteristics of simple and practicable process and high controllability, can acquire high end capping rate (greater than 95%) and low color (less than 50), endows the product with high reaction activity, and at the same time ensures the quality indexes of the finished product.