The invention discloses a generating method and device of a face image. The method comprises: obtaining an RGB three-channel color image of a real face, and generating a face position rectangle frameand facial feature point coordinates according to the same; obtaining PCA (Principal Component Analysis) appearance parameters and PCA expression parameters of a 3DMM (3-Dimensional Morphable Model) face model and an affine transformation matrix, of projecting the three-dimentional face to the RGB three-channel color image according to the face position rectangle frame and facial feature point coordinates to reconstruct a three-dimensional model of the face; generating color information, which corresponds to each sampling point in a three-dimentional lattice which is of the face and is obtained by three-dimentional reconstruction, according to the RGB three-channel color image and the reconstructed three-dimentional model of the face; generating a four-channel RGBA face image and face positioning point coordinates on the basis of the color information, the PCA appearance parameters, the PCA expression parameters, light ray material and face angle information; and generating the face image according to a pre-collected general scene picture labeled with a face position and the four-channel RGBA face image. Existing color images can be converted into near-infrared (NIR) images, and collection costs of the near-infrared images are reduced.