The invention provides a catalyst for preparing glycidyl ester of neodecanoic acid and belongs to the technical field of catalysts. The catalyst is DBU (1,8-diazacyclo hendecene) or DBN (1.5-diazabicyclo [4.3.0]-5-nonylene). A preparation method of using the catalyst for the glycidyl ester of neodecanoic acid comprises the following steps of heating neodecanoic acid-1-chlorinated glyceride, addingthe catalyst for reaction, adding water in a reaction liquid, performing washing to neutral, performing static stratification to remove a water phase, and after removing water from an oil phase, performing reduced pressure distillation to obtain a glycidyl ester product of the neodecanoic acid. The catalyst provided by the invention is high in catalytic activity, rapid in reaction speed and mildin condition. By applying the catalyst to preparation of the glycidyl ester of neodecanoic acid, the reaction time can be effectively shortened, an amount of reaction byproducts is small, a separationstep is omitted, and the reaction yield is increased at the same time. The DBU and DBN catalysts are stable, are good in quality of products and higher in yield and product purity, can lower the costthrough recovery and reusing and provide a better selection for industrial production.