The utility model relates to the field of metal solidification and continuous casting, in particular to a support roller device for deforming corners of chamfered continuous castings. The support roller device comprises support rollers (1) each having an alpha-angle slope, movable bearing blocks (2), bearing block moving rails (3), bearing block motion control mechanisms (4), and an inner arc or outer arc frame (5) of a casting machine. The support rollers (1) are arranged on the inner arc and/or outer arc frame (5) in the horizontal segment of the casting machine. The support faces of the support rollers (1) contact and squeeze with small blunt corners (7), in contact with an inner/outer arc large surface, of a chamfered continuous casting (6), so that each small blunt corner (7) is squeezed into two large blunt corners (8-1) and (8-2). The support roller device has the advantages that on the premise of fully controlling and eliminating transverse cracks in corners, the shape of the corners of the castings is optimized and straight cracks in the edges of plates are eliminated.