This invention relates to a rotary dryer with multi-drying chambers which is developed and improved for drying materials such as cassava chip, paddy, corn, various crops, longan, fertilizer, biomass and mining industry with better drying efficiency. The rotary dryer with multi-drying chambers according to this invention comprises a base frame, a drive assembly installed on the base frame, in which the drive assembly comprises a motor and a plurality of rollers, a drying chamber assembly having a moist material inlet part at one end and a dried material outlet part at the other end, in which the moist material inlet part and the dried material outlet part are installed on the rollers of the drive assembly, a moist material inlet assembly capped to the moist material inlet part and installed on the base frame, a dried material outlet assembly capped to the dried material outlet part and installed on the base frame and a housing encompassed the drying chamber assembly and installed on the base frame, characteriz
