The invention relates to a super-finishing machine swing mechanism. The super-finishing machine swing mechanism comprises a power device, a swing shaft base, a swing shaft, a swing assembly and a transmission shaft; and a driven component of the power device is installed on the swing shaft base, the swing shaft is fixedly installed inside the swing shaft base, the outer circumferential face of the swing shaft is joined with the inner circumferential face of the swing shaft base, and the transmission shaft is connected with the swing shaft through the swing assembly. The swing shaft base is of an exocentric structure, the axial center line of the outer circumferential face of the swing shaft base is parallel to the axial center line of the inner circumferential face of the swing shaft base. The axial center line of the outer circumferential face of the swing shaft base is parallel to the axial center line of the swing shaft. After the swing mechanism technology is adopted, a super-finishing machine can be suitable for different machining environments and can be suitable for superfinishing of an inner ring and an outer ring of a bearing, the process motion is convenient to adjust and accurate, and the reliability is high.