The air cooling line transports through the conveyer belt and completes the product cooling under the functions of upper cooler. It is especially suitable for the cooling of frying food and the rapid cooling of products after steaming and halogenation; The length of the equipment and the number of fans can be customized according to the requirements. The machine is composed of frame, sprocket, fan, motor, conveyor belt, and has the advantages of convenient transportation, easy installation, fast speed, power saving and so on.