The utility model discloses a yellow phosphorus purifying device which comprises an extraction tank (27), a crystallizer (7), a zone melting device and a filter device, wherein a pipeline from an extraction tank yellow phosphorus outlet (6) to a crystallizer yellow phosphorus outlet (22) is provided with a yellow phosphorus pump; a pipeline from a crystallizer yellow phosphorus outlet (26) to a buffer tank yellow phosphorus outlet (33) is also provided with a yellow phosphorus conveying pump; a zone melting equipment high-purity yellow phosphorus outlet (34) is connected with a phosphorus pressing tank yellow phosphorus inlet (8) through a pipeline; a phosphorus pressing tank yellow phosphorus outlet (10) is connected with a filter yellow phosphorus inlet (17) through a pipeline. The device disclosed by the utility model purifies yellow phosphorus by combining extraction, crystallizing, zone melting and filtering processes, and can improve the purity of phosphorus while the effect is relatively good.