The number of heating and air mixing times of the drying furnace is 10, which is appropriate. Drying furnace heating and mixed air is a new drying furnace heating system technical solution. The patented technology of this utility model provides a new type of drying furnace heating system, which includes a mixed air chamber, a second heat exchanger, a number of circulating fans, a hot smoke pipe, a first heat exchanger, an induced draft fan, and a wind box. The first heat exchanger is located in the flue of the high-temperature furnace and is connected to the induced draft fan through a hot smoke pipe. The induced draft fan is connected to the second heat exchanger through a pipeline. The second heat exchanger is The heat exchanger is located in the mixed air chamber. The new drying furnace heating system described in the patented technology of this utility model adds a first heat exchanger to the waste heat flue of other high-temperature furnaces. The first heat exchanger heats the air in the pipe, and the heated air enters through the pipe. The mixed air chamber above the furnace body of the drying furnace performs secondary heat exchange through the heat exchanger. The air with a certain temperature absorbed from the furnace is heated and sprayed onto the steel pipe through the wind box to meet the drying requirements of the drying furnace. While painting the surface of the steel pipe, existing resources can be utilized to the maximum extent to save energy and reduce emissions.