A method and a device of reading images are disclosed. The image reading device includes plural color light sources, at least three monochrome image sensor columns and at least one lens column between the sensing material and the monochrome image sensor column; wherein, the lens column is used to directly image at least part of the reflected light on the monochrome image sensor columns. The method for reading color images comprises the steps of synchronously moving the plural color light sources, the lens columns and the monochrome image sensors to a fixed direction, switching the light colors projected by the plural color light sources every time a predetermined distance is moved; and reading out a signal generated by the monochrome image sensor columns due to sensing images. The method for reading monochrome images comprises the steps of using the plural color light sources to project at the same time to mix into a white light and project onto the sensed objects, synchronously moving the plural color light sources, the lens columns and the monochrome image sensors, every time a predetermined distance is moved, reading out a signal generated by the monochrome image sensor columns due to sensing images.