In terms of the drying mechanism, material and thermal current rotary in double-drum drying machine/drier exchange more fully, scientificly and reasonably. The thermal index of rotary double-drum drying machine/drier reaches the leading level. This Rotary double-drum drying machine/drier structure is compact. The horizontal layout, the supporting roller bearing, canceled size gear transmission, acting with jockey pulley drive, make the equipment installation and more and more simple, control, operation is more reliable, the higher rate of operation.