NOVELTY - Low temperature dry distillation device comprises a conveying device (1), which is connected to a storage hopper (2), and the storage hopper is connected with a measuring device (3). The measuring device is connected to a drying furnace (14) and a buffer chamber (6). The measuring device via first air lock feeding device is connected with the drying furnace, and the drying furnace connected with the buffer chamber through first discharging air locking device. The buffer chamber is connected with rotary dry distillation furnace and the refrigerating device.    USE - The low-temperature dry distillation device is useful for oil sand, oil sludge, oil shale and biomass (claimed).    ADVANTAGE - The device solves the problems of solid materials e.g. adhesion and wall accretion in the pyrolysis process by material returning. The method is simple in process and reliable and stable in operation, and has obvious advantages in the treatment of small particle materials e.g. oil shale, oil sand, oil sludge (oil sludge on the ground, oil sludge at the bottom of a tank and oil-containing sludge from oil refinery) and biomass.    DETAILED DESCRIPTION - Low temperature dry distillation device comprises a conveying device (1), which is connected to a storage hopper (2), and the storage hopper is connected with a measuring device (3). The measuring device is connected to a drying furnace (14) and a buffer chamber (6). The measuring device via first air lock feeding device is connected with the drying furnace, and the drying furnace connected with the buffer chamber through first discharging air locking device. The buffer chamber is connected with rotary dry distillation furnace and the refrigerating device. The buffer chamber is connected with rotary dry distillation furnace via second air lock feeding device, and the rotary dry distillation furnace is connected with a cooling device via second discharging air locking device. An INDEPENDENT CLAIM is also included for low temperature dry distillation method for oil sand, oil sludge, oil shale and biomass, comprising: (i) mixing the raw material, oil sand, oil sludge, oil shale or biomass, crushing and sieving to the desired particle size, and passing from conveying device to the raw material storage bin, measuring in a counting device, and passing into the drying furnace via first air lock feeding device; (ii) drying and dehydrating the raw material after pre-heating in the buffering chamber through discharging air locking device, and passing into the rotary dry distillation furnace via second air lock feeding device; (iii) heating the hot flue gas raw material for dry distillation in the rotary dry distillation furnace external heating jacket and/or the internal heating tube, if raw material has large viscosity, and poor mobility, taking the rotary dry distillation furnace before the addition of mixing equipment or reverse feeding device for distillation, maintaining temperature of rotary dry distillation furnace and pressure to be slightly positive or slightly negative, and passing pyrolysis reaction gas into the exhaust gas treatment step for separating and recovering the components; (iv) discharging the solid pyrolysis product from the rotary dry distillation furnace discharge end, passing into second into the cooling device via discharging air lock device, cooling in the cooler shell, and packaging the finished product.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the low-temperature dry distillation device.    Conveying device (1)    Storage hopper (2)    Measuring device (3)    Buffer chamber (6)    Drying furnace (14)