The invention belongs to the field of composite material warp knitting machines, and particularly relates to a chain transmission device for a carbon fiber multi-axial warp knitting machine. The carbon fiber multi-axial chain transmission device comprises a base and is characterized in that the base is provided with a guiding assembly, the carbon fiber multi-axial chain transmission device further comprises a U-shaped faller, a chain set matched with the guiding assembly is arranged at the bottom of the faller, a U-shaped groove of the faller is internally provided with a slidable sliding plate, and a tensioning part is arranged between the faller and the sliding plate. The chain transmission device fixes the end of a carbon fiber sheet through clamping of the sliding plate and the faller, the problem that the fixing reliability degree of a needle type chain transmission mechanism in the prior art on the end of the carbon fiber sheet is poor is solved, furthermore, a first rolling part and a second rolling part which can prevent the faller from inclination in the moving process are arranged, and movement smoothness of the chain transmission device is guaranteed.