An image colorizing method and device are provided, which relate to the field of image processing technology. The method includes acquiring a grayscale image to be colorized, classifying the grayscale image to determine the grayscale image is a human face image or a human image, providing the grayscale image to a neural network based image colorizing model corresponding to the type of the grayscale image to obtain color information for respective pixels in the grayscale image. The image colorizing model is a human face image colorizing model if the grayscale image is a human face image, the image colorizing model is a human image colorizing model if the grayscale image is a human image. The method further includes synthesizing the grayscale image and the color information to obtain a color image.