Quantitative analysis of total fluorine in tea was established by using ¹⁹F quantitative nuclear magnetic resonance combined with the pretreatment method of oxygen bomb combustion. The ¹⁹F qNMR method used the signal characteristic of fluoride ion at δ=-119 as the qualitative peak and the signal characteristic of trifluoroacetic acid at δ=-75 as the internal standard peak. The fluorine-containing substances in tea sample was burned by oxygen bomb and converted into inorganic fluorine. Mixed metal chelating agent which included sodium citrate and disodium EDTA was added to eliminate interference and then the absolute content of fluoride ion in tea was determined. The minimum detection concentration of the method is 2.0 μg/mL. The results of the quality control samples were satisfactory. The recovery rate of the actual samples were 96.3%~107.0% and the method repeatability and precision were good. The sample test can be completed within 30 minutes which effectively reduces the analysis time and the measurement result is accurate and reliable by using the method to determine the total fluorine content in tea.