Pyrotechnic composition drying machine and cleaning method thereof

The invention discloses a pyrotechnic composition drying machine and a cleaning method thereof. The pyrotechnic composition drying machine comprises a drying box assembly, a plurality of conveying devices and a plurality of guiding plates, wherein a feeding port used for putting a pyrotechnic composition to be dried is formed on the drying box assembly, the plurality of conveying devices are arranged in the drying box assembly at intervals in the height direction of the drying box assembly, and the widths of the conveying devices are sequentially increased from top to bottom; the conveying devices are provided with a plurality of concave holes used for being matched with the pyrotechnic composition, so that the pyrotechnic composition can be conveyed in a preset conveying direction; the conveying directions of the two adjacent conveying devices are opposite, and the guiding plates are obliquely arranged towards one ends of the conveying devices so as to adjust the movement track of thepyrotechnic composition