An image display method for a mobile terminal, comprising: acquiring (S101, S201) a target image in a preview picture in response to a photographing instruction; displaying (S102, S202, S305) the target image at a preset position on a screen of the mobile terminal; and gradually increasing a size of the target image from a first size to a second size during the displaying; characterized in that the method further comprises: displaying a text box in the preview picture when a camera in the mobile terminal is started before the target image in the text box is acquired and the text box is hidden, wherein the displaying a text box in the preview picture when the camera in the mobile terminal is started, comprises: acquiring four coordinate points of the text box in the preview picture through an edge detection; and drawing the text box in real time according to the four coordinate points, wherein when lens of the camera in the mobile terminal move, content in the preview picture changes constantly, a result of edge detection changes constantly, and a position of the text box in the preview picture change constantly. acquiring (S101, S201) a target image in a preview picture in response to a photographing instruction; displaying (S102, S202, S305) the target image at a preset position on a screen of the mobile terminal; and gradually increasing a size of the target image from a first size to a second size during the displaying; characterized in that the method further comprises: displaying a text box in the preview picture when a camera in the mobile terminal is started before the target image in the text box is acquired and the text box is hidden, wherein the displaying a text box in the preview picture when the camera in the mobile terminal is started, comprises: acquiring four coordinate points of the text box in the preview picture through an edge detection; and drawing the text box in real time according to the four coordinate points, wherein when lens of the camera in the mobile terminal move, content in the preview picture changes constantly, a result of edge detection changes constantly, and a position of the text box in the preview picture change constantly. displaying a text box in the preview picture when a camera in the mobile terminal is started before the target image in the text box is acquired and the text box is hidden, wherein the displaying a text box in the preview picture when the camera in the mobile terminal is started, comprises: acquiring four coordinate points of the text box in the preview picture through an edge detection; and drawing the text box in real time according to the four coordinate points, wherein when lens of the camera in the mobile terminal move, content in the preview picture changes constantly, a result of edge detection changes constantly, and a position of the text box in the preview picture change constantly. acquiring four coordinate points of the text box in the preview picture through an edge detection; and drawing the text box in real time according to the four coordinate points, wherein when lens of the camera in the mobile terminal move, content in the preview picture changes constantly, a result of edge detection changes constantly, and a position of the text box in the preview picture change constantly.