In order to explore the influence of low-frequency vibration on metal flow of swing rolling for spline teeth, the metal flow condition of spline teeth under different vibration mode parameters were numerical simulated and experimentally researched. The results show that the metal in the active deformation zone of workpiece flows radially to the surroundings, and the metal flow is the most violent at the workpiece edge. There is an obvious shunt plane of metal flow in the height direction. Based on the shunt plane, the metal flow velocity decreases gradually from the upper surface to the lower surface, and the farther away from the shunt plane, the smaller the tangential flow velocity of metal. Low-frequency vibration can effectively improve the uniformity of workpiece deformation and the filling effect of tooth shape. The greater the frequency and amplitude, the more conductive to the axial and radial flow of metal materials, and the better the forming effect of spline tooth profile. The vibration-assisted swing rolling experiment of spline tooth obtains the spline tooth swing rolling part with full tooth shape and uniform upper and lower material flow, and the results are basically consistent with the numerical simulation results.