Heating and drying furnace with forward and reverse hot air circulation

The invention discloses a heating and drying furnace with forward and reverse hot air circulation. The heating and drying furnace is characterized by comprising a furnace body; a heating and drying chamber, a heating system and a forward and reverse hot air circulation system are arranged in the furnace body, and the heating system and the forward and reverse hot air circulation system are connected and located outside the heating and drying chamber. Since the forward and reverse alterative hot air circulation system is utilized, the heating and drying furnace is simple in structure, safe and reliable in use, is energy saving; temperature uniformity of the inside of the heating and drying furnace can be guaranteed to the utmost extent; the internal space of the whole heating and drying furnace is utilized effectively; the productivity is improved.