This article presents the results of research on increasing the cleaning efficiency of cotton by heating. As a result, the cleaning efficiency decreased with increasing equipment productivity. However, in the IV-industrial variety with high moisture content of cotton, the temperature of the cotton fiber was 30 when the working productivity increased to 6000 kg/h. Cleaning efficiency at 32°S was found to have reached 45.3%, indicating that the air temperature was 110 which corresponds to 130°S.