The invention discloses a shielded metal arc welding method for high-manganese non-magnetic steel with tensile strength of 1000 MPa. The shielded metal arc welding method comprises the following steps: (1) preparation of a welded steel plate: a welding groove is a double-sided symmetric V-shaped groove, the groove angle is 55-60 degrees, the truncated edge of the welding groove is 1-2 mm, the welded steel plate is assembled, and a 2-3 mm assembling clearance is reserved; (2) pretreatment of the welded steel plate: rust and oil stain on the groove are removed, and the welded steel plate is not pre-heated; (3) pretreatment of a welding rod: the welding rod is dried before use; and (4) welding: a weldment seam is divided into a plurality of segments, segmental welding is performed, the welded seam area is water-sprayed for cooling after welding of each segment, after that, the next segment is welded, and heat treatment is not conducted after welding. The shielded metal arc welding method is low in cost, solves the embrittling and softening problems of the heat-affected zone of a joint, reduces welding deformation, can obtain a welding joint which is favorable in forming and excellent in mechanical property, and effectively controls the magnetic conductivity of a weld joint.