Tea was modified by reagent, and the removal of fluorine from wastewater using modified tea was studied. The effect of pH, modified reagent concentration and dosage of modified tea on the removal rate of fluorine were investigated. Adsorption isotherm was established. The results showed that for 0.3 mol/L FeCl₃ solution showed the best effect on the modification of a 100 mL fluorine solution (containing was 100.0 mg/L fluorine), the optimum pH value of 1.3 g modified tea in removing fluorine were 6.0. Moreover, it was showed that adsorption of fluorine for modified tea conformed to Freundlich adsorption isotherm.