The invention discloses a connecting method and a connecting structure for a 3D (three-dimensional) printing reinforced masonry shear wall. The connecting method comprises the following steps: respectively manufacturing a first wall part and a second wall part of the reinforced masonry shear wall by adopting the 3D printing technology, wherein the end part of the first wall part and the end part of the second wall part respectively form a butt joint slot, horizontal steel bars are respectively anchored in the first wall part and the second wall part, and one end of each horizontal steel bar protrudes and forms an anchoring end in the corresponding butt joint slot; arranging the butt joint slot of the first wall part and the butt joint slot of the second wall part in a butt joint manner to form a butt joint space; respectively inserting vertical steel bars into the first wall part, the butt joint space and the second wall part at intervals; pouring concrete in the first wall part, the butt joint space and the second wall part to form the 3D printing reinforced masonry shear wall. According to the connecting method and the connecting structure for the 3D printing reinforced masonry shear wall, the overall anti-seismic property and the thermal insulation property of the 3D printing wall are ensured.