The invention discloses a novel high-temperature epoxidation reaction process. The novel high-temperature epoxidation reaction process sequentially comprises a dropwise adding stage and a continuous reaction stage and comprises the following specific steps that 1, at the dropwise adding stage, formic acid and vegetable oil are firstly fully mixed, then hydrogen peroxide is dropwise added; at the continuous reaction stage: heating is firstly performed to reach 68 DEG C, the reaction is performed for 5 hours, then heating continues to reach 78 DEG C, and similarly reaction is performed for 5 hours. The novel high-temperature epoxidation reaction process is simple in working procedure and high in reaction efficiency. Compared with a traditional process, the adding amount of the hydrogen peroxide can be decreased by about 5%, the adding amount of the formic acid can be decreased by about 10%, the production cost is reduced, the residual hydrogen peroxide content in waste water is 1-3% after the reaction, the formic acid content is less than 1%, and the sewage treatment cost is reduced.