Objective To develop a method that can quickly determine the absolute content of boron in food by quantitative nuclear magnetic resonance （qNMR） analysis technology.Methods The signal area is directly proportional to the content of boron causing the peak under certain sample-acquired condition. Natural quartz NMR tubes （boron content <0.01×10^-6） was used to eliminate the interference. boron trifluoride etherate was used as an internal standard （δ=0 ppm） in Deuterium Oxide. Signal peak δ=19.38 ppm was set as the characteristic chemical shift of boric acid to pick peaks， integrate， and perform later mathematical operation. Boric acid was extracted from samples with deionized water since its glorious solvability.Results The linearity and the method repeatability of the method were good： y=507.81x+5 597.4， R2>0.999 9. The LODs and the LOQs were 20 and 60 mg/kg， respectively. The recoveries ranged from 90.3% to 102.1%. The precision between days was 1.26%-1.61%.Conclusion There are some good potential application prospects as for its simple pretreatment， quick measurement process， and accurate experimental result.