Quantitative control device for defluorination of reverse osmosis wastewater

The utility model discloses a reverse osmosis wastewater defluorination quantitative control device in the technical field of water treatment, which comprises a bottom plate, one side of the upper end of the bottom plate is fixedly connected with a liquid storage cylinder, one side of the bottom of the liquid storage cylinder is connected with a first valve body, and the first valve body is connected with a telescopic pipe. And the other side of the upper end of the bottom plate is fixedly connected with a sliding plate. The piston is movably connected in the liquid injection cylinder, the position of the piston can be adjusted in the liquid injection cylinder, then the volume of the liquid injection cylinder is adjusted, quantitative injection of a solvent is adjusted, the solvent is guided into the liquid injection cylinder through the liquid guide column through the telescopic pipe, the telescopic pipe is matched to stretch out and draw back in different lengths, and when the solvent is guided into the liq