The invention relates to a high-rigidity carbon fiber roll shaft and a preparing method thereof and belongs to the technical field of carbon fiber composite materials. The high-rigidity carbon fiber roll shaft is characterized in that an inner carbon fiber layer, an outer carbon fiber layer and a carbon fiber pipe are included, and the carbon fiber pipe is arranged between the inner carbon fiber layer and the outer carbon fiber layer. The preparing method of the high-rigidity carbon fiber roll shaft comprises the following steps that firstly, a layer of carbon fibers are wound on a roller for preparing the carbon fiber roll shaft, and the winding angle is close to zero degree as much as possible; secondly, a layer of pultrusion unidirectional carbon fiber pipe is laid on the carbon fiber layer obtained in the last step; thirdly, a layer of carbon fibers are wound on the carbon fiber pipe again; fourthly, curing forming is conducted. By means of the method, fiber bundles are not damaged, the winding angle of the carbon fibers can be zero degree to the maximum degree, and a high-rigidity carbon pipe bundle can be obtained.