Air knife

The utility model provides an air knife, which belongs to the technical field of air knives and comprises an air knife main body, a plurality of air inlets are arranged on the air knife main body along the length direction, and an air outlet is arranged at one end of the air knife main body far away from the air inlets along the length direction. An air flow release filling cavity, an air flow equalizing runner, an air flow compression cavity, a linear runner and an air flow adjusting cavity which are arranged in the length direction and sequentially communicate with one another are formed in the air knife body, the air flow release filling cavity communicates with the air inlet, and the air flow adjusting cavity communicates with the air outlet; an airflow release filling cavity, an airflow equalizing runner, an airflow compression cavity, a linear runner and an airflow adjusting cavity are formed in the air knife body, and the uniformity of the airflow at an outlet is guaranteed by adjusting the airflow. 本实