Carbon fiber tube with limiting groove in outer surface as well as preparation method and preparation mold for carbon fiber tube

The invention discloses a carbon fiber tube with a limiting groove in the outer surface. During usage, the carbon fiber tube is an inner tube and is matched with an outer tube to form a telescopic unit in a telescopic tube, a limiting bulge is arranged on the inner surface of the outer tube, the limiting groove matched with the limiting bulge is formed in the outer surface of the carbon fiber tube in the length direction of the carbon fiber tube so as to limit the circumferential rotation of the carbon fiber tube and the outer tube, and the carbon fiber tube is not required to be machined additionally and is simple in structure and convenient to assemble and use. The invention further discloses a preparation method and a preparation mold which are used for preparing the carbon fiber tube with the limiting groove in the outer surface. Steps are simple, and operation and usage are convenient.