A bottom radiating zone-control polyimide fiber drier is characterized in that a machine frame is included, the machine frame is divided into a plurality zones, a first coaxial through hole, a second coaxial through hole and a third coaxial through hole are formed in the lower portion, the upper portion and the middle portion of each zone respectively, each zone is fixedly connected with a large transmission roller, a first small transmission roller, a second small transmission roller, a transmission device, a power device, a radiator and a temperature sensor respectively, the large transmission rollers, the first small transmission rollers and the second small transmission rollers are arranged on the same side of the machine frame, arranged in the first coaxial through holes, the second coaxial through holes and the third coaxial through holes in a penetrating mode and are fixedly connected, the transmission devices are placed on the other side of the machine frame and are fixedly connected with the large transmission rollers, the power devices are placed in the transmission frame and are fixedly connected with driving chain wheels of the transmission devices, the radiators are placed in the machine frame and are fixedly connected, the radiators are in sealing connection with steam pipelines, a temperature control device is fixedly connected with the machine frame, electric adjusting valves are in sealing connection with the radiators and the steam pipelines respectively, a protecting cover is arranged outside the machine frame in a covering mode and is fixedly connected, and a motor, the radiators, the temperature sensors and the electric adjusting valve are electrically connected with a control panel respectively.