Method and device for material drying by means of porous media

The invention discloses a method and device for material drying by means of porous media. According to the method and device, materials are dried with a countercurrent method; the materials to be dried in a drying bin are mixed with the porous media in a material distributing bin, the mixture is then put into a first drying layer and is in contact with hot air from a second drying layer fully to achieve heat exchange, heat is absorbed, water is evaporated, and then the materials are dried; waste hot air passing the first drying layer is discharged out of the drying bin; the mixture of materials passing the first drying layer and the porous media enter a screening device, then the materials are separated from the porous media through screening, and the porous media return to the material distributing bin to be mixed with the materials to be dried; the materials passing the first drying layer enter the second drying layer to be in contact with hot air from a third drying layer to achieve heat exchange and are c