The invention relates to a preparing device and method of a double-layer laminated carbon fiber composite. The device comprises a thin-wall surface component producing device used for producing thin-wall surface components, a support component producing device which is arranged with the thin-wall surface component producing device in parallel and used for producing support components and a die assembly gluing device used for gluing the thin-wall surface components and the support components. The device can fully automatically produce the double-layer laminated carbon fiber composite. The selective absorption of the upper and lower surfaces of parts can be realized, and the parts can be turned upside down, so that the flexibility is high. The stability of the turned materials is ensured, and the turning precision is improved. Time spent on turning and transferring is reduced, so that the production efficiency of a carbon fiber composite production line is effectively increased.