The invention discloses a novel stone material external corner structure which comprises a stone material A (1) and a stone material C (3). The stone material A (1) is provided with a molding face I (11), a molding face II (12) and a molding face III (13), and the stone material C (3) is provided with a molding face IV (31) and a molding face V (32). The molding face III (13) of the stone material A (1) is an oblique plane and serves as an appearance face of a non-sharp external corner, an adhesion agent is filled between the molding face I (11) of the stone material A (1) and the molding face IV (31) of the stone material C (3) so as to enable the stone material A (1) and the stone material C (3) to be firmly bonded. The molding face II (12) of the stone material A (1) is parallel to a polished face of the stone material A (1), the molding face V (32) of the stone material C (3) is perpendicular to the molding face of the polished face of the stone material C (3), and the molding face II (12) is matched and spliced with the molding face V (32). The 45-degree centered splicing is changed into lateralized splicing, and the severe defects of edge breakage, overlarge splicing adhesive joints and the like produced in the common process production and installation process are effective overcome.