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The most important factor in maintaining quality during cotton processing is to significantly reduce moisture content. Therefore, in order to improve the drying process of cotton raw materials, a test model of a drum drying device was created in the Laboratory of Chemical Technology Processes and Devices of the Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan. In this device, the experimental process was carried out in a drying drum with a length of 2 meters. It was studied that the normal movement of the product depends on its inclination angle ∠ and the number of rotations n. Graphs were made based on the obtained results. It was observed that the heat supplied to the raw material is uniformly distributed along the length of the device, so the loss of moisture is also uniform. It was observed during the experiment that the air temperature inside the drum was 70… 120 °C. An attempt was made to clarify these indicators on the basis of tables and graphs. We were convinced of this during the drying process of seed cotton in the experimental device. It was stated that the angle of inclination of our recommended drying drum is ∠ 6 ° and its number of rotations is n=12 rot/min.