Pressure wave generating device based on fan

The invention discloses a pressure wave generating device based on a fan. The pressure wave generating device comprises a rack, an axial flow fan, a controller and an air outlet structure. The axial flow fan and the controller are both installed on the rack, the controller is connected with the axial flow fan, and the rotating speed of the axial flow fan is controlled through a PWM pulse width signal or a pulse number PTO signal; the air outlet structure is of a cavity structure with two open ends, one end of the air outlet structure is an air inlet end, the other end of the air outlet structure is an air outlet end, and the diameter of the air outlet end is larger than that of the air inlet end, so that the whole air outlet structure is of a horn-shaped structure; and the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan. The device can generate pressure wave signals such as sine in the atmospheric environment and can be used for researching an infrasound tr