Vacuum drum drying device

The utility model discloses a vacuum rotary drum drying device which comprises a supporting frame, a rotary drum body rotationally installed on the supporting frame through a transmission shaft and a material turning motor installed on the supporting frame and in transmission connection with the transmission shaft. The rotary drum body comprises an outer shell rotationally installed on the supporting frame and an inner cavity formed in the outer shell, and a separation cavity is formed between the outer shell and the inner cavity; a heat-conducting medium is accommodated in the separation cavity, and the separation cavity is connected with a circulating heating system; an air suction pipeline is installed in the inner cavity, and one end of the air suction pipeline penetrates out of the outer shell and is connected with a vacuumizing device. According to the utility model, the cyclic heating of the heat-conducting medium in the partition cavity is realized through the cyclic heating system, so that the device