Corn steep liquid and corn husk is uniformly mixed in the mixture and conveyed into feed machine when the moisture content of wet corn husk reaches 35% to 40%. Then the feed machine delivers the wet corn husk into the drying drum. Inside the drum are uniformly distributed flights and sets of agitators, which lift the wet corn husk ups and downs. The wet materials get fully contacted with hot air and realize the process of mass transfer and heat transfer.