The heat-sealing circulation oven adopts a fan circulating air supply method, and the air circulation is even. The air source is driven by the circulating air motor to drive the wind wheel through the heater, and the hot air is sent out, and then to the inner chamber of the oven through the air duct, and then the used air is sucked into the air duct to become the air source for recirculation and heating. Ensure the uniformity of indoor temperature. When the temperature value swings due to the switch action, the air circulation system quickly restores the operating state until it reaches the set temperature value.