The invention discloses an energy-saving hot blast drying device, which comprises a heating chamber and a drying chamber, wherein the heating chamber and the drying chamber are connected by an air inlet pipe and an air return pipe, the heating chamber comprises a hot blast stove and a stove outer wall, the stove outer wall surrounds the hot blast stove, the hot blast surface is separated into an upper part and a lower part, the upper part is provided with a combustion chamber, the lower part is provided with a slag outlet chamber, the middle part is provided with an air collection device, a chimney is arranged at the top part of the hot blast stove, a heat gathering chamber is formed between the stove outer wall and the top part of the hot blast stove, the air inlet pipe is positioned on the stove outer wall of the heat gathering chamber, and the air return pipe is positioned at the bottom parts of the heating chamber and the drying chamber. The energy-saving hot blast drying device has the beneficial effects that by arranging the air collection device under the combustion chamber, fuel can be fully combusted, so the energy source is saved; by arranging the air inlet pipe and the air return pipe between the heating chamber and the drying chamber, the hot blast can be recycled, so the utilization efficiency of heat energy is improved; by forming moisture exhaust holes in the bottom part of the drying chamber, the moisture in the drying chamber can be well exhausted, and the drying effect is better.