The invention discloses an air fryer heated by a heat cycle formed by a cyclone, which comprises: a windshield, the windshield is open at the lower part, and has a small hole in the center of the upper part; a motor assembly, the motor assembly is installed on the The upper part of the windshield, and includes a motor transmission shaft, the motor transmission shaft passes through the small hole in the upper center of the windshield; an exhaust fan, the exhaust fan is installed in the windshield, and is connected to the windshield The motor transmission shafts are connected; the rotating air duct unit is installed in the windshield, and is located below the exhaust fan, and is connected and fixed with the windshield through a connecting column. The upper part of the channel unit is provided with a ventilation opening, and the lower part is open, wherein the rotating air channel unit can make the wind going vertically downward through the joint action of the exhaust fan and the windshield rotate and go downward at a certain angle, forming whirlwind. The air fryer heats through the cyclone to form a heat cycle so that the hot air can bake the food more evenly.