A method and a device are used for generating a jacquard pattern of a preform. The method comprises acquiring initial structure information of a preform to be prepared; generating an initial jacquard pattern of the preform to be prepared; pixel values of pixels in the initial jacquard pattern, comprising a first pixel value and a second pixel value, are equal to the first pixel value when warp yarns corresponding to the pixels are located above corresponding weft yarns, and are equal to the second pixel value when warp yarns corresponding to the pixels are located below corresponding weft yarns; acquiring yarn reduction information of the preform to be prepared; and adjusting the initial jacquard pattern according to the yarn reduction information to obtain the jacquard pattern of the preform to be prepared.