In order to study the influence of external packed walls on the seismic performance of prefabricated shear walls, a 1:3 scale prefabricated shear wall specimen with two layers of prefabricated (PC) packed walls was designed and manufactured. The deformation form, maximum floor acceleration, maximum relative floor displacement and interfloor displacement Angle of shear wall structure under different seismic intensities were obtained by shaking table test, and the mechanical performance of the specimen was further studied by finite element simulation method. The results show that the prefabricated filled wall set in Y direction provides a certain lateral stiffness to the shear wall structure and reduces the structural deformation in this direction. It is suggested to consider its influence on the overall stiffness of the structure in the design of the structure. The wall cracks are mainly distributed in the parts of connecting beams, the corners of door and window openings and the parts of wall limbs, and eventually the bearing capacity is lost due to the concrete fracturing in the parts of wall limbs.