Energy-saving type drying and heating barrel

The utility model relates to the technical field of drying heating barrels, in particular to an energy-saving drying heating barrel which comprises an outer barrel, an inner barrel and a heating pipe, the inner barrel is arranged inside the outer barrel, a cold air channel is formed between the inner barrel and the outer barrel, the cold air channel is communicated with a cold air inlet in the bottom of the inner barrel, and the heating pipe is arranged in the outer barrel. A hot air outlet is formed in the upper end of the inner barrel, a hot air pipe is connected to the hot air outlet, the end, away from the hot air outlet, of the hot air pipe penetrates through the outer barrel from inside to outside and extends to the outer side of the outer barrel, and an air inlet is formed in the top of the outer barrel and communicates with a cold air duct; the multiple heating pipes penetrate into the outer barrel from the bottom of the outer barrel and extend into the inner barrel. The drying device has the advantag