The invention relates to a method and system for shooting a document image automatically, and belongs to the field of image shooting. In the prior art, images are acquired mostly in a manual mode, and shot document images cannot easily meet the requirement of follow-up processing. According to the method and system, firstly, a camera is switched on to obtain current parameters, whether a current environment is suitable for shooting is judged, and the camera is used for collecting video streams or the images of a document to be shot if the current environment is suitable for shooting; secondly, whether an effective document exists in the video streams or the images is judged; thirdly, whether a jittering blur exists in the video streams or the images is judged; lastly, the camera is driven to conduct automatic focusing, the shooting of the document to be shot is completed, and the document image is obtained. When the method and system are used for shooting the document image, whether the shooting environment meets requirements, whether the effective document exists in the shooting process, and whether jittering exists in the shooting process can be detected automatically, and the document image can be obtained automatically.