The tunnel type hot air circulation sterilization oven adopts the principle of air purification and quartz tube infrared heating technology to heat and sterilize bottles. There is purified air protection at the entrance and exit of the tunnel, forming an air curtain at the tunnel entrance to prevent external air pollution. The purification device adopts a negative pressure sealing form, which is conducive to simplifying installation. At the same time, the machine is also equipped with a special patented device that continuously updates the air in high-temperature areas, in compliance with GMP standards. The laminar airflow in the preheating and cooling sections of the machine can be sourced from indoor air or from the user's duct air. The constant temperature method of the heating device breaks the basic heating method of current transmission, and adopts synchronous power adjustment to achieve constant temperature, with uniform and reliable temperature.