The present application is applicable to the field of image proces technology, and provices a method for generating a high dynamic range image, a mobile terminal and a computer readable storage medium. The method comprises: obtaining a preview picture collected by a camera of the mobile terminal, and identifying foreground objects in the preview screen, based on the foreground objective, selectinga preset number of cameras from a plurality of cameras of the mobile terminal as a target camera, and determining the exposure time corresponding to each target camera, controlling the target camerato acquire images based on the corresponding exposure time, obtaining the image corresponding to each exposure time, and synthesizing the image corresponding to each exposure time to obtain a high dynamic range image. The application can reduce the shooting time of the high dynamic range image and solve the problem of blurring the outline of a local object.