The invention relates to a spraying-spinning method for preparing a high-density coating on the surface of a shaft part. The method comprises the following process steps of: thermally spraying metal, metal ceramic or a ceramic coating on the partial surface of the shaft part nearly pressed by a spinning roller by adopting an SHS (Self-Propagating High-Temperature Synthesis) reaction thermal spraying method in the thermal spinning of the shaft part; and immediately pinning processing the shaft part before cooling so that the coating generates remarkable plastic deformation under the pressure of the spinning roller. Accordingly, the invention eliminates coating holes, greatly improves the compactness and the cohesion strength of the coating and the boundary combination strength between the coating and the shaft part.