The embodiment of the invention discloses a prompt method and device, a storage medium, and a mobile terminal. The method comprises the following steps: when a blocking detection event is triggered, acquiring a photographing preview image; inputting the photographing preview image into a pre-trained blocking detection model; determining whether a first blocked area exists in the photographing preview image or not according to an output result of the blocking detection model; and prompting a user to remove a blocking object when it is determined that the first blocked area exists in the photographing preview image, wherein the blocking object comprises an object that causes the existence of the first blocked area in the photographing preview image. The prompt method and device, the storagemedium and the mobile terminal adopting the technical scheme have the advantages that blocking detection is carried out on the photographing preview image through the pre-constructed blocking detection model, whether the blocked area exists in the photographing preview image or not is judged accurately and rapidly, and the user is prompted in time to remove the blocking object when it is determined that the first blocked area exists in the photographing preview image, so that the quality of a photographed image can be effectively improved.