Axial flow fan, air conditioner outdoor unit and air conditioner

The utility model discloses an axial flow fan, an air conditioner outdoor unit and an air conditioner, and the axial flow fan comprises an installation panel, an air inlet, an air outlet and an air outlet, the protective cover is fixed on the mounting panel and covers the ventilation opening; the wind wheel is rotatably arranged at the ventilation opening, and the motor is fixed to the protective cover and connected with the wind wheel to drive the wind wheel to rotate; the air guide ring surrounds the periphery of the wind wheel, the air guide ring and the wind wheel are of an integrated structure, and an air duct is defined between the air guide ring and the mounting panel. According to the axial flow fan, the axis of the wind wheel and the axis of the ventilation opening can be located on the same straight line as much as possible, the gap between the wind wheel and the side wall of the ventilation opening can be conveniently reduced, and the situation that part of the gap between the wind wheel and the side wall of the ventilation opening is too large or too small is avoided; the gap between the wind wheel and the side wall of the ventilation opening is small while it is guaranteed that the wind wheel does not collide with the installation panel during rotation, and therefore the backflow amount of the axial flow fan is reduced.