The invention relates to a drying machine, which comprises a drying machine body. A drying chamber capable of being inclosed is arranged in the drying machine body, a heating device is arranged in the drying chamber, one side of the drying chamber is provided with a gate, and a rolling drum is arranged in the drying chamber. An air intake pipeline is communicated with the drying chamber from the outside of the drying machine body and is provided with an air intake control valve. An air discharging pipeline is communicated with the drying chamber from the outside of the drying machine body andis provided with an air discharging control valve. An air pumping pipeline is communicated with the drying chamber from the outside of the drying machine body and is provided with a pipeline control valve and a pump.