The invention discloses a fluorite ore reselection and flotation combined beneficiation technology. The fluorite ore reselection and flotation combined beneficiation technology comprises a first-level reselection technology, a second-level waste throwing reselection technology and a third-level flotation technology which are directly connected in sequence. In the first-level reselection technology, fluorite ore is subjected to primary crushing, primary flushing and dense medium separation, and fluorite finished ore and residual ore are obtained. In the second-level waste throwing reselection technology, the residual ore is subjected to secondary crushing, secondary flushing and dense medium separation, fluorite enriched ore and waste ore are obtained, ore pulp generated through primary flushing and secondary flushing is subjected to concentration and thickening treatment through an ore pulp recycling system, and then fluorite enriched ore is obtained. In the third-level flotation technology, the fluorite enriched ore is ground, stirred and subjected to flotation treatment, and then acid-level fluorite fine powder and tailings are obtained. The fluorite ore reselection and flotation combined beneficiation technology can replace the manual hand sorting technology, the labor intensity is lowered, the labor force is liberated, the fluorite resource recycling rate and the water and suspension liquid recycling rate are increased, the waste throwing proportion is increased, the kinds of commodity fluorite can be enriched, and the producing and machining cost is greatly reduced.