The utility model relates to a support device with an aluminum honeycomb sandwich layer and carbon fiber coverings, which comprises a support plate, a metal connecting ring and at least three metal connecting seats. The support plate includes the aluminum honeycomb sandwich layer and the carbon fiber coverings fixed to two sides of the aluminum honeycomb sandwich layer. Connecting lugs projecting outwards and corresponding to the metal connecting seats in number are evenly distributed on the metal connecting ring, and each connecting lug is provided with a plurality of through holes. Each metal connecting seat includes a metal connecting plate corresponding to the connecting lugs in shape and a metal connecting post fixedly and perpendicularly connected with the metal connecting plate, a plurality of threaded holes are arranged in the metal connecting post, and a plurality of notches matched with the metal connecting posts in shape are evenly distributed on the outer periphery of the support plate. The support device solves the technical problems of low strength, poor stability and low precision of existing support devices, and has the advantages of high strength, fine stability, high precision, light weight and the like.