Axial flow cooling fan

An axial flow cooling fan comprises a frame body, a rotating shaft and fan blades, the fan blades are arranged on the periphery of the rotating shaft and integrally assembled in the frame body, and the axial flow cooling fan is characterized in that the edges of the fan blades are in close clearance fit with the inner wall of the frame body, a turbulent flow groove is formed in the inner wall of the frame body, and the trend of the turbulent flow groove is opposite to the trend of the fan blades. According to the axial flow cooling fan, the turbulent flow groove has the function of disturbing the path of airflow at the outlet end in the fan frame body. When air flows in the flow channel of the frame body, the volume pressure difference of the fluid at the inlet end and the outlet end of the fan can form regular high-frequency noise at the outlet of the frame body along with increase of the rotating speed and the flow speed, the turbulent flow groove has the effect of disturbing the path of the air flow at the