Hot air circulation furnace

The utility model relates to a hot air circulation furnace which is even in heating and capable of reducing resource loss, in particular to a hot air circulation furnace which comprises a heat preservation box, the upper surface of the inner wall of the heat preservation box is fixedly connected with the upper surface of a fixing plate, and external air is extracted through a three-way pipe and an exhaust pipe a through a compressor and heated. The heated air is discharged into the air heater through the connecting pipe so that the air can be rapidly heated, the pressure sensor detects the air pressure in a cavity between the heat preservation box and the baking box, when the pressure reaches a threshold value, the three-way valve is started, and the compressor extracts the air between the heat preservation box and the baking box through the exhaust pipe b to conduct hot air circulation. The baking oven is heated by hot air, so that food in the baking oven is uniformly heated, and the problem that the heating