The invention provides a prefabricated shear wall connecting structure including L-shaped steel plates with studs, a horizontal anchoring rib and a filling material; the lower surface of the upper prefabricated shear wall is machined into a convex shape, the L-shaped steel plates are pre-buried on the two sides of the convex shape; one corner limb of each L-shaped steel plate is pre-buried on theupper prefabricated shear wall through a stud, and is provided with a vertical hole allowing a longitudinal steel bar to pass through, the two extending longitudinal reinforcing steel bars form a closed annular rib I; a vertical connecting steel bar is arranged on the upper surface of the lower prefabricated shear wall or the foundation, and the two vertical connecting steel bars form a closed annular rib II; the filling material is poured on the two sides of the convex shape on site, and the horizontal anchoring rib horizontally penetrates through the filling material in the closed annular rib I and the closed annular rib II, and a bolt or an anchorage device is adopted for anchoring through a reserved horizontal hole in the convex-shaped part and horizontal holes of the L-shaped steel plates. According to the invention, the working performance of the connecting section of the site pouring filling material and the prefabricated shear wall structure can be effectively improved, and meanwhile, the overall anti-seismic performance of the shear wall structure is improved.