The invention provides a medicinal material drying device which comprises a driving rail which carries out transmission in a closed circulation manner, an immobile transportation rail which is positioned below the driving rail, a heat insulating curtain baffle which is fixed along the edge of the driving rail, a grid-like rotary drum which is placed on the transportation rail and an elastic skewed tooth which is aslant fixed on the lower end surface of the driving rail; the skewed tooth pushes the rotary drum to roll on the transportation rail in a conveying process; a drying channel is formed between the driving rail and the transportation rail by the heat insulating curtain baffle; and a hot air inlet and a rotary drum placement port are formed in the drying channel. The medicinal material drying device has the beneficial effects that the medicinal materials are heated evenly, the drying efficiency of the medicinal materials is improved, and the production cost is saved.