The invention belongs to the field of boron carbide production equipment, and especially relates to a dedusting purifying device used for boron carbide production. The dedusting purifying device usedfor boron carbide production comprises a crushing device and a dedusting device; the dedusting device is communicated with the side wall of the crushing device through a dedusting pipeline and a blower fan; the dedusting pipeline is communicated with the top of the dedusting device; the dedusting device comprises a dedusting housing; a dedusting mechanism, a grading mechanism, and a filtering mechanism are arranged in the dedusting housing using a supporting frame; the top of the dedusting mechanism is provided with a spiral coil pipe; the lower end of the spiral coil pipe is provided with spray nozzles stretching into the dedusting mechanism; the end part of the spiral coil pipe is connected with an external water tank; the lower end of the dedusting mechanism is connected with the grading mechanism and the filtering mechanism through a branched pipeline; a filter screen and a scraper plate device matching the filter screen are arranged in the filtering mechanism. The dedusting purifying device is novel in structure and reasonable in design; working environment purifying effect is excellent; boron carbide collecting effect is excellent; yield is high; and the practicality is high.