Disclosed are a two-dimensional image depth of field generation method and device, the method including: obtaining a target image, classifying the target image to obtain corresponding multiple image classes, and calculating the maximum sharpness value corresponding to each image class; respectively acquiring an object of each image class to estimate sharpness value of the object of each image class, and classifying the object of each image class based on the maximum sharpness values corresponding to each image class; estimating depth value of the object of each image class using a depth value estimation algorithm, based on the sharpness value of the classified object of each image class; and estimating depth of field value of the object of each image class using a depth of field value estimation algorithm, based on the depth value of the object of each image class.