An embodiment of the invention provides an automatic landing method and device and an air vehicle. The automatic landing method comprises the steps of determining the acquired ground image to be a target image when an automatic landing event of the air vehicle is detected; analyzing the determined target image, when the fact that no landing graphic object is included in the target image is determined after analysis, controlling the air vehicle to move in the direction of a signal source of an indication signal according to strength of the received indication signal, acquiring a new ground image after movement of the air vehicle, and after the new ground image is determined to be the target image, executing the step repeatedly until the fact that the target image includes the landing graphic object is determined after analysis; after the fact that the target image includes the landing graphic object is determined after analysis, executing landing control over the air vehicle according to the landing graphic object determined by analysis. By means of the automatic landing method and device, the air vehicle can be guided to land automatically, conveniently, quickly and accurately under the conditions of weak GPS signals, and demands on automatic and intelligent control over the air vehicle of an air vehicle user are met well.