Vibration was applied during plasma surfacing welding of Fe314 self-fluxing alloy powder additive manufacturing process. The changes of microstructures, properties, stress and deformation of the formed parts subjecting to vibration were analyzed and compared by means of blind hole method, scanning electron microscope, tension test and so on. The results show that it is detrimental to the formation of thin-walled parts and fine structures after the vibration is applied, however, the residual deformation and residual stress of the formed sample are improved to some extent. When the vibration acceleration is 4 m/s(2) and 6 m/s(2), the residual stress and deformation can be obviously reduced. After vibration, the microstructure of the formed samples is significantly refined and the tensile properties are improved. When the vibration acceleration is 4 m/s(2), the dendrites are significantly refined and the comprehensive mechanical properties are distinctly improved.