Axial flow fan and axial flow fan

The utility model relates to the technical field of axial flow fans, and discloses an axial flow fan which comprises a hub. The first blades are arranged in the circumferential direction of the hub at intervals, hollow containing cavities are formed in the first blades, and openings are formed in the front edge sides of the first blades; the blade switching mechanism comprises a second blade rotatably arranged in the containing cavity, the second blade at least can be controlled to translate and switch between a moving-out state and a moving-in state, the moving-out state comprises that the second blade moves out of the containing cavity through the opening, and the moving-in state comprises that the second blade moves into the containing cavity through the opening. The air volume can be changed under the condition that the rotating speed of the axial flow fan is not changed, or the larger air volume can be obtained at the higher rotating speed. The utility model further discloses the axial flow fan. 本申请涉及轴流风