The invention discloses a vacuum belt 
drying machine. The vacuum belt 
drying machine comprises a left cabin door, a 
solid material feeding cabin, a left isolation 
air brake, a 
liquid extract feeding cabin, an adjusting cabin, a main engine cabin, a 
powder material discharging cabin, a right isolation 
air brake, a 
solid material discharging cabin and a right cabin door which are sequentially connected from left to right. A two-way chain-type drive unit comprises a motor, a driving shaft, 
sprocket wheels, conveyer belt connecting holes, conveyer belt staple bolts, chain connection plates, a chain, a plurality of heating plates, a conveyer belt, a driven shaft and cylinders. The motor drives the driving shaft to rotate; the 
sprocket wheels are arranged on the driving shaft; the 
sprocket wheels and the chain form an inlay transmission structure; the conveyer belt connecting holes are arranged in the conveyer belt, the chain connection plates are arranged between the chain and the conveyer belt, the conveyer belt staple bolts 
traverse the conveyer belt connecting holes and connect the chain, the chain connection plates and the conveyer belt together; the plurality of heating plates are arranged on the conveyer belt; and the driven shaft is connected with the cylinders, and the chain is connected between the driving shaft and the driven shaft.