Fixed bed desulfurization reactor with efficient purification function

The utility model discloses a fixed bed desulfurization reactor with an efficient purification function. The fixed bed desulfurization reactor comprises a desulfurization reactor body, a fixed bed device and an ash discharge cover, a partition plate is arranged in the middle of an inner cavity of the desulfurization reactor body, a fixed bed device is arranged above the partition plate, ash discharge covers are arranged below the partition plate, and the two ash discharge covers correspond to desulfurization agent bed layers of the fixed bed device; a dust removal mechanism is arranged on the dust discharge cover and comprises an annular plate; the annular plates are arranged on the outer ring of the ash discharge cover in a sleeving mode, bristles are arranged on the inner ring of the annular plates and make contact with the side wall of the ash discharge cover, connecting blocks are arranged on one sides of the annular plates respectively and connected with the curved bars through movable shafts, and the dr