The invention discloses a segmented second intermediate roller for a Sendzimir mill. The segmented second intermediate roller for the Sendzimir mill comprises a second intermediate roller core consisting of multiple sections of segmented roller cores; baffle plates are arranged at two ends of the second intermediate roller core; the outer side of the second intermediate roller core is connected with segmented sleeves corresponding to the segmented roller cores one to one; elastic shaft sleeves and preventing parts for preventing mutual rotation of the segmented roller cores and the segmented sleeves are arranged between the segmented roller cores and the segmented sleeves; the elastic shaft sleeves are arranged in the connecting places of the two segmented roller cores; the preventing parts are arranged between the two elastic shaft sleeves; bearings are correspondingly arranged out of the segmented sleeves one to one; and the bearings are serially connected by support roller mandrels. The whole structure reduces local rigidity of the mill under the condition of guaranteeing overall rigidity of the mill, improves the adjusting capacity of an ASU convexity adjusting device, improves the plate shape adjusting capacity of the mill, correspondingly reduces the support counter force suffered by the ASU device, and achieves a certain protecting effect on the adjusting device.