Medicament and method for reducing fluorine bio-availability of southern acidic tea garden soil

The invention provides a medicament and a method for reducing the biological availability of fluorine in southern acidic tea garden soil, and particularly relates to the field of soil remediation, the method is characterized in that calcium bentonite and active apatite are ground and mixed according to a certain proportion to prepare the medicament, the calcium bentonite in the medicament has a strong adsorption effect on fluorine ions under an acidic condition, and the active apatite has a strong adsorption effect on fluorine ions under the acidic condition; as calcium ions are released from the solution, F can react with the calcium ions to generate CaF2 precipitate, so that the fluorine content of the soil is reduced; the active apatite in the medicament is high in safety, free of dissolution of any toxic and harmful substances in the use process, high in fluorine removal capacity and high in adaptability, and is subjected to adsorption and ion exchange dual reaction with F, and the fluorine removal purpos