The utility model discloses a phosphoric acid purification device which comprises an extraction device, a cleaning device and a back-extraction device, wherein the extraction device selects a single stage formed by a group of mixers and phase separation facilities, or multiple stages formed by combining multiple groups of mixers and phase separation facilities; the cleaning device and the back-extraction device select a single stage formed by a group of emulsifying machines and phase separation facilities, or multiple stages formed by combining multiple groups of emulsifying machines and phaseseparation facilities; a continuous phase fluid inlet of the extraction device is connected with a light phase outlet of a final-stage phase separation facility of the back-extraction device; a one-stage solvent inlet of the cleaning device is connected with a light phase outlet of a final-stage phase separation facility of the extraction device; and a one-stage solvent inlet of the back-extraction device is connected with a light phase outlet of a final-stage phase separation facility of the cleaning device. Due to the adoption of the phosphoric acid purification device, the mass transfer performance can be enhanced, the purification efficiency is improved, the facility investment and the operation cost are reduced, and the occupied area is small.