The invention relates to a roller sleeve based on a universal expansion mandrel. The sleeve is made of magnesium-aluminium alloy materials. The outer diameter of the sleeve can be of different sizes. Two steel sleeves of the united specification are arranged in the sleeve. The expansion mandrel is of a stepped shaft structure of the united specification. Two expansion segments with deformable cylindrical faces are arranged on the expansion mandrel. Hydraulic oil is arranged in the expansion segments. The pressure of the hydraulic oil is changed by rotating a handle on the mandrel, and therefore the interference fit relation or the clearance fit relation between the steel sleeve and the expansion mandrel is changed, flexible conversion of the sleeve is achieved, and more printing functions are expanded on the same platform.