Abstract: In order to improve the construction efficiency of the prefabricated shear wall and guarantee its seismic performance, this paper proposes a new concrete modular integrated building core filling shear wall structure. The structure forms a monolithic connection by presetting core-filled apertures in the precast wall and pouring concrete twice. Based on the low-cycle reversed loading test, two pieces of core-filled shear walls are designed to be compared and analyzed with one piece of cast-in-place shear wall in order to study the seismic performance of this new type of core-filled shear wall monolithic structure. The experimental findings revealed that all specimens exhibited similar crack propagation patterns, with distinct vertical cracks observed in the core-filled regions of the innovative walls. The ultimate bearing capacity of the core-filled shear wall is 1603.45 kN, and that of the cast-in-place shear wall is 1767.53 kN, with a difference of 9.28%, which indicates that their bearing capacities are comparable. The ductility coefficient of the core-filled shear wall is 2.32, and the ductility coefficient of the cast-in-place shear wall is 2.29, with a difference of 1.31%. In addition, the core-filled shear wall has a significant advantage in energy absorption and dissipation. In summary, the new core-filled shear wall structure has good seismic performance and energy absorption characteristics, and its bearing capacity and ductility are comparable to that of cast-in-place shear wall, and it has obvious advantages in construction efficiency, so it can be used as a form of high-efficiency seismic-resistant structure in prefabricated buildings.