The utility model discloses a miropowder drying device, specifically speaking are carborundum miropowder drying -machine, including rotary drum and support, the outside suit transmitting?gear of rotary drum, set up and the transmitting?gear engaged with driving gear on the support, rotary drum one side opening, air -out end that other has the air heater to go out the tuber pipe pass in the opening extends to the rotary drum, be equipped with the moisture absorption layer on the anchor ring of laminating on the interior anchor ring of rotary drum, owing to adopted above -mentioned technical scheme, a carborundum miropowder drying -machine carry out the drying through setting up drying device in the rotary drum air in to the rotary drum, and the circulated relapse of dry run improves the utilization ratio of drier, avoids the steam to?re -enter?the miropowder of evaporation, avoids the differential phenomenon that hardens, improves micro -powder processing efficiency.