The invention relates to an image defogging processing method and device, a storage medium and a mobile terminal. The method includes the steps of acquiring a to-be-processed image; acquiring a dark channel value corresponding to each pixel in the to-be-processed image and conducting statistics on the number of dark channel values within a preset range; and if the number exceeds a threshold, performing defogging processing on the to-be-processed image by a preset defogging way. Before the to-be-processed image is defogged, the image defogging processing method and device, the storage medium and the mobile terminal determine whether a preset condition is satisfied according to the dark channel values and perform defogging processing on the to-be-processed image satisfying the preset condition so as to avoid defogging processing on all images. The efficiency of image processing is improved, and the power consumption of the image processing device is reduced.