In the stirred state, NaOH (36.19 g, 0.905 mol) is slowly added to the solution of chloroene glycol (100.0 g, 0.905 mol) and ethanol (200 ml) at 0-5 degrees, and then the reaction mixture is stirred at 0-5 degrees for 2 small chemicalbooks, after the end of the reaction, the reaction mixture is filtered to remove the insoluble solid precipitate, and the resulting filtrate can be vacuum concentrated at 40 degrees to obtain the target product (R)-glycidyl (Note (R). - Glycidyl has a low boiling point, and low temperature treatment is required when post-processing vacuum concentration).