Automobile self-closed air outlet capable of preventing howling under high air pressure

The invention relates to an automobile self-closed air outlet capable of preventing howling under high air pressure. The automobile self-closed air outlet comprises an air outlet shell, a connecting rod and lower layer blades, wherein a row of lower layer blades is transversely installed in the air outlet shell, the lower layer blades are connected with the inner wall of the air outlet shell in arotating manner, the lower portion of each lower layer blade is connected with the connecting rod in a rotating manner, two sides of the inner wall of the air outlet shell are respectively provided with a first step portion and a second step portion, when the air outlet is closed, every two adjacent lower layer blades are arranged in a vertical stacking manner, the lower layer blades on two sidesare respectively laminated with the lower portion of the first step portion and the upper portion of the second step portion, a plurality of first bulge portions are longitudinally distributed on partial lower layer blades in