The invention discloses a technology of reducing the content of double caramel color 4-methylimidazole. The technology comprises the following steps: 1) raw material measurement: measuring a finished product of double caramel color, and feeding into a reaction tank; 2) primary reaction: keeping the raw material temperature at 70-80 DEG C, adding a Grignard reagent RMgX, continuously stirring and keeping the temperature for 60-70min to end the reaction; 3) secondary reaction: adding a complexing agent potassium sodium tartrate into the material obtained when the primary reaction ends, and stirring for 30-40min. According to the invention, the finished product of caramel color is treated successively by the Grignard reagent and potassium sodium tartrate, the content of double caramel color 4-methylimidazole is effectively reduced, and the safety of the product of double caramel color is remarkably improved.